386:
45:
164:. But it also follows the first definition above (along with virtually all other geographic authorities and publications) in using the combined Missouri—lower Mississippi length figure in lists of lengths of rivers around the world. Most rivers have numerous tributaries and change names often; it is customary to regard the longest tributary or stem as the source, regardless of what name that watercourse may carry on local maps and in local usage.
281:
135:
156:(USGS) states that a river's "length may be considered to be the distance from the mouth to the most distant headwater source (irrespective of stream name), or from the mouth to the headwaters of the stream commonly known as the source stream". As an example of the second definition above, the USGS at times considers the
210:
Under this definition, neither a lake (excepting lakes with no inflows) nor a confluence of tributaries can be a true river source, though both often provide the starting point for the portion of a river carrying a single name. For example, National
Geographic and virtually every other geographic
254:
official on a USGS site, that " generally follow the longest tributary to identify the source of rivers and streams." In the case of the
Missouri River, this would have the source be well upstream from Lewis and Clark's confluence, "following the Jefferson River to the
183:. The latter definition includes sometimes-dry channels and removes any possible definitions that would have the river source "move around" from month to month depending on precipitation or ground water levels. This definition, from geographer Andrew Johnston of the
215:'s outlet where the name "Nile" first appears, which would reduce the Nile's length by over 900 km (560 mi) (dropping it to fourth or fifth on the list of world's rivers), but instead use the source of the largest river flowing
415:
The furthest stream is also often called the head stream. Headwaters are often small streams with cool waters because of shade and recently melted ice or snow. They may also be glacial headwaters, waters formed by the melting of
430:, as opposed to the outflow or discharge of a watershed. The river source is often but not always on or quite near the edge of the watershed, or watershed divide. For example, the source of the
703:
234:
When not listing river lengths, however, alternative definitions may be used. The
Missouri River's source is named by some USGS and other federal and state agency sources, following
223:. Likewise, the source of the Amazon River has been determined this way, even though the river changes names numerous times along its course. However, the source of the
855:
568:
The verb "rise" can be used to express the general region of a river's source, and is often qualified with an adverbial expression of place. For example:
532:
496:
765:
664:
707:
250:, rather than the source of its longest tributary (the Jefferson). This contradicts the most common definition, which is, according to a
848:
789:
1086:
1454:
167:
This most commonly identified definition of a river source specifically uses the most distant point (along watercourses from the
404:-like, in which the "uppermost" or most remote section of the marsh would be the true source. For example, the source of the
251:
841:
353:
325:
17:
372:
332:
310:
2080:
1611:
643:
483:
153:
2075:
306:
227:
in
England is traditionally reckoned according to the named river Thames rather than its longer tributary, the
1636:
490:
339:
526:
302:
1777:
1727:
1621:
2111:
2055:
321:
188:
2106:
1281:
596:
31:
740:
2116:
2065:
2017:
1900:
689:
2050:
1767:
1732:
1574:
291:
260:
672:
2060:
1752:
1517:
722:
295:
184:
180:
2101:
2002:
1860:
1411:
1296:
204:
1840:
1687:
1649:
1098:
1037:
52:
207:
but is "in a location that is the farthest, along water miles, from where that river ends."
2070:
1792:
1616:
1376:
1233:
1183:
977:
636:
346:
8:
1966:
1961:
1762:
1606:
1228:
1081:
1002:
909:
796:
119:
1992:
1905:
1870:
1722:
1238:
1143:
1047:
939:
872:
606:
601:
584:
435:
264:
1712:
1971:
1810:
1802:
1742:
1702:
1591:
1406:
1168:
1158:
944:
467:
161:
1885:
1787:
1692:
1441:
1291:
1286:
1263:
1203:
1032:
904:
256:
235:
176:
1890:
1850:
1845:
1449:
1336:
1331:
1115:
1052:
1022:
987:
982:
949:
914:
885:
611:
400:
Sometimes the source of the most remote tributary may be in an area that is more
247:
179:), or, alternatively, as the furthest point from which water could possibly flow
115:
761:
1951:
1835:
1815:
1697:
1682:
1569:
1554:
1549:
1509:
1489:
1401:
1243:
1223:
1188:
1120:
1105:
1012:
934:
894:
471:
439:
431:
427:
172:
157:
99:
833:
114:
begin accumulating into a more substantial and consistent flow that becomes a
2095:
2032:
2027:
2012:
1997:
1946:
1941:
1707:
1672:
1626:
1586:
1581:
1341:
1213:
1173:
919:
899:
547:
534:
511:
498:
491:
U.S. Geological Survey
Geographic Names Information System: Mississippi River
447:
443:
243:
239:
212:
466:
geographic feature, with only one mouth and one source. For an example, the
2022:
1772:
1757:
1747:
1596:
1527:
1396:
1361:
1276:
1218:
1093:
992:
929:
479:
389:
224:
220:
192:
111:
527:
U.S. Geological Survey
Geographic Names Information System: Missouri River
385:
1931:
1855:
1559:
1522:
1469:
1193:
1178:
1153:
1027:
228:
168:
75:
71:
38:
44:
2037:
1717:
1601:
1541:
1499:
1371:
1208:
1076:
1017:
1007:
924:
616:
405:
196:
91:
2007:
1956:
1926:
1895:
1825:
1737:
1494:
1381:
1366:
1306:
1253:
1248:
1148:
1071:
1061:
959:
123:
107:
103:
48:
280:
94:
with another river. Each headwater is considered one of the river's
1677:
1644:
1321:
1163:
1130:
145:
139:
1987:
1936:
1464:
1459:
1421:
1326:
1198:
1135:
575:
The White Nile rises in the Great Lakes region of central Africa.
417:
200:
79:
1782:
1654:
1479:
1474:
1426:
1416:
1386:
1311:
1066:
997:
969:
868:
211:
authority and atlas define the source of the Nile River not as
67:
1880:
1865:
1820:
1564:
1537:
1484:
1351:
1346:
1316:
1301:
1110:
880:
864:
787:
409:
401:
393:
134:
63:
1910:
1875:
1431:
1391:
1356:
580:
83:
1830:
1271:
723:"Could the River Thames be longer than the River Severn?"
420:
87:
704:"IBGE - Instituto Brasileiro de Geografia e Estatística"
583:
rather than rivers or streams, refers to the lake's
665:"National Geographic News @ nationalgeographic.com"
191:when pinpointing the source of rivers such as the
762:"Owens Valley Particulate Matter Plan: Q & A"
2093:
828:Watersheds: Processes, Assessment and Management
122:downstream of the headwaters is regarded as the
30:"Headwater" redirects here. For other uses, see
863:
790:"Limnological investigations in Lake San Pablo"
529:, Length: 2,540 miles (4,090 km), Source:
493:, Length: 2,340 miles (3,770 km), Source:
242:'s naming convention, as the confluence of the
203:agrees, stating that a river source is never a
118:of that river. The tributary with the longest
849:
776:...the Owens River, the source of the lake...
811:...source of the lake is the River Itambi...
788:Jorge Enrique Casallas Guzmán (2004-02-11).
684:
682:
426:Headwater areas are the upstream areas of a
629:
474:sources are officially defined as follows:
309:. Unsourced material may be challenged and
856:
842:
572:The River Thames rises in Gloucestershire.
690:"The True Utmost Reaches of the Missouri"
679:
373:Learn how and when to remove this message
231:— although not without contention.
384:
133:
43:
1455:International scale of river difficulty
14:
2094:
720:
837:
637:"Largest Rivers in the United States"
480:"Largest Rivers in the United States"
199:. A definition given by the state of
70:is the farthest point on each of its
741:"CERC Science Topic: Missouri River"
307:adding citations to reliable sources
274:
579:The word "source", when applied to
175:from which water runs year-around (
24:
270:
25:
2128:
563:
279:
1612:Flooded grasslands and savannas
820:
766:Environmental Protection Agency
644:United States Geological Survey
484:United States Geological Survey
154:United States Geological Survey
781:
754:
733:
714:
696:
657:
13:
1:
721:Bailey, David (15 May 2012).
622:
129:
1778:Universal Soil Loss Equation
1728:Hydrological transport model
1622:Storm Water Management Model
7:
669:news.nationalgeographic.com
590:
189:National Geographic Society
98:, as it is the place where
10:
2133:
1282:Antecedent drainage stream
597:Source of the Amazon River
453:
252:US Army Corps of Engineers
36:
32:Headwater (disambiguation)
29:
2046:
2018:River valley civilization
1980:
1919:
1901:Riparian-zone restoration
1801:
1663:
1635:
1536:
1508:
1440:
1262:
1129:
1046:
968:
879:
826:DeBarry, Paul A. (2004).
263:, then Red Rock Creek to
27:Starting point of a river
2081:Countries without rivers
2056:Rivers by discharge rate
1768:Runoff model (reservoir)
1733:Infiltration (hydrology)
830:. John Wiley & Sons.
1753:River Continuum Concept
1518:Agricultural wastewater
185:Smithsonian Institution
2076:River name etymologies
2003:Hydraulic civilization
1861:Floodplain restoration
1637:Point source pollution
1412:Sedimentary structures
548:45.92750°N 111.50806°W
397:
187:, is also used by the
160:as a tributary of the
149:
55:
1688:Discharge (hydrology)
1650:Industrial wastewater
1131:Sedimentary processes
512:47.23944°N 95.20806°W
388:
137:
116:first-order tributary
47:
37:For the company, see
1793:Volumetric flow rate
1377:Riffle-pool sequence
748:infolink.cr.usgs.gov
553:45.92750; -111.50806
303:improve this section
142:, Italy, inscribed:
1967:Whitewater kayaking
1962:Whitewater canoeing
1763:Runoff curve number
1607:Flood pulse concept
544: /
517:47.23944; -95.20806
508: /
51:near its source at
2112:Freshwater ecology
1993:Aquatic toxicology
1906:Stream restoration
1871:Infiltration basin
1723:Hydrological model
1239:Sediment transport
1062:Estavelle/Inversac
940:Subterranean river
675:on April 13, 2001.
607:Spring (hydrology)
602:Source of the Nile
436:Continental Divide
398:
265:Hell Roaring Creek
150:
74:upstream from its
56:
18:Source (hydrology)
2107:Fluvial landforms
2089:
2088:
2066:Whitewater rivers
1972:Whitewater slalom
1803:River engineering
1703:Groundwater model
1664:River measurement
1592:Flood forecasting
1407:Sedimentary basin
1264:Fluvial landforms
1169:Bed material load
945:River bifurcation
468:Mississippi River
383:
382:
375:
357:
162:Mississippi River
144:Here is born the
16:(Redirected from
2124:
2117:River morphology
2051:Rivers by length
1886:River morphology
1788:Wetted perimeter
1693:Drainage density
1204:Headward erosion
1033:Perennial stream
905:Blackwater river
858:
851:
844:
835:
834:
814:
813:
808:
807:
801:
795:. Archived from
794:
785:
779:
778:
773:
772:
758:
752:
751:
745:
737:
731:
730:
718:
712:
711:
706:. Archived from
700:
694:
693:
686:
677:
676:
671:. Archived from
661:
655:
654:
652:
650:
641:
633:
559:
558:
556:
555:
554:
549:
545:
542:
541:
540:
537:
523:
522:
520:
519:
518:
513:
509:
506:
505:
504:
501:
487:
462:is considered a
392:, source of the
378:
371:
367:
364:
358:
356:
315:
283:
275:
257:Beaverhead River
248:Jefferson Rivers
21:
2132:
2131:
2127:
2126:
2125:
2123:
2122:
2121:
2092:
2091:
2090:
2085:
2061:Drainage basins
2042:
1976:
1915:
1891:Retention basin
1851:Erosion control
1846:Detention basin
1797:
1713:Hjulström curve
1665:
1659:
1631:
1575:Non-water flood
1532:
1504:
1450:Helicoidal flow
1436:
1337:Fluvial terrace
1332:Floating island
1258:
1133:
1125:
1116:Rhythmic spring
1050:
1042:
1023:Stream gradient
964:
950:River ecosystem
915:Channel pattern
883:
875:
862:
823:
818:
817:
805:
803:
799:
792:
786:
782:
770:
768:
760:
759:
755:
743:
739:
738:
734:
719:
715:
702:
701:
697:
688:
687:
680:
663:
662:
658:
648:
646:
639:
635:
634:
630:
625:
612:Strahler number
593:
566:
552:
550:
546:
543:
538:
535:
533:
531:
530:
516:
514:
510:
507:
502:
499:
497:
495:
494:
478:
456:
438:separating the
379:
368:
362:
359:
316:
314:
300:
284:
273:
271:Characteristics
132:
100:surface runoffs
42:
35:
28:
23:
22:
15:
12:
11:
5:
2130:
2120:
2119:
2114:
2109:
2104:
2087:
2086:
2084:
2083:
2078:
2073:
2068:
2063:
2058:
2053:
2047:
2044:
2043:
2041:
2040:
2035:
2030:
2025:
2020:
2015:
2010:
2005:
2000:
1995:
1990:
1984:
1982:
1978:
1977:
1975:
1974:
1969:
1964:
1959:
1954:
1952:Stone skipping
1949:
1944:
1939:
1934:
1929:
1923:
1921:
1917:
1916:
1914:
1913:
1908:
1903:
1898:
1893:
1888:
1883:
1878:
1873:
1868:
1863:
1858:
1853:
1848:
1843:
1838:
1836:Drop structure
1833:
1828:
1823:
1818:
1816:Balancing lake
1813:
1807:
1805:
1799:
1798:
1796:
1795:
1790:
1785:
1780:
1775:
1770:
1765:
1760:
1755:
1750:
1745:
1743:Playfair's law
1740:
1735:
1730:
1725:
1720:
1715:
1710:
1705:
1700:
1698:Exner equation
1695:
1690:
1685:
1683:Bradshaw model
1680:
1675:
1669:
1667:
1661:
1660:
1658:
1657:
1652:
1647:
1641:
1639:
1633:
1632:
1630:
1629:
1624:
1619:
1614:
1609:
1604:
1599:
1594:
1589:
1584:
1579:
1578:
1577:
1572:
1570:Urban flooding
1562:
1557:
1555:Crevasse splay
1552:
1550:100-year flood
1546:
1544:
1534:
1533:
1531:
1530:
1525:
1520:
1514:
1512:
1510:Surface runoff
1506:
1505:
1503:
1502:
1497:
1492:
1490:Stream capture
1487:
1482:
1477:
1472:
1467:
1462:
1457:
1452:
1446:
1444:
1438:
1437:
1435:
1434:
1429:
1424:
1419:
1414:
1409:
1404:
1402:Rock-cut basin
1399:
1394:
1389:
1384:
1379:
1374:
1369:
1364:
1359:
1354:
1349:
1344:
1339:
1334:
1329:
1324:
1319:
1314:
1309:
1304:
1299:
1294:
1289:
1284:
1279:
1274:
1268:
1266:
1260:
1259:
1257:
1256:
1251:
1246:
1244:Suspended load
1241:
1236:
1234:Secondary flow
1231:
1226:
1224:Retrogradation
1221:
1216:
1211:
1206:
1201:
1196:
1191:
1189:Dissolved load
1186:
1181:
1176:
1171:
1166:
1161:
1156:
1151:
1146:
1140:
1138:
1127:
1126:
1124:
1123:
1121:Spring horizon
1118:
1113:
1108:
1106:Mineral spring
1103:
1102:
1101:
1091:
1090:
1089:
1087:list in the US
1084:
1074:
1069:
1064:
1058:
1056:
1044:
1043:
1041:
1040:
1035:
1030:
1025:
1020:
1015:
1013:Stream channel
1010:
1005:
1000:
995:
990:
985:
980:
974:
972:
966:
965:
963:
962:
957:
952:
947:
942:
937:
935:Drainage basin
932:
927:
922:
917:
912:
907:
902:
897:
895:Alluvial river
891:
889:
877:
876:
861:
860:
853:
846:
838:
832:
831:
822:
819:
816:
815:
780:
753:
732:
713:
710:on 2011-06-15.
695:
678:
656:
627:
626:
624:
621:
620:
619:
614:
609:
604:
599:
592:
589:
577:
576:
573:
565:
564:Related usages
562:
561:
560:
524:
488:
472:Missouri River
455:
452:
446:watersheds of
440:Atlantic Ocean
432:Colorado River
381:
380:
322:"River source"
287:
285:
278:
272:
269:
261:Red Rock River
219:the lake, the
173:drainage basin
158:Missouri River
131:
128:
26:
9:
6:
4:
3:
2:
2129:
2118:
2115:
2113:
2110:
2108:
2105:
2103:
2102:Water streams
2100:
2099:
2097:
2082:
2079:
2077:
2074:
2072:
2069:
2067:
2064:
2062:
2059:
2057:
2054:
2052:
2049:
2048:
2045:
2039:
2036:
2034:
2033:Surface water
2031:
2029:
2028:Sacred waters
2026:
2024:
2021:
2019:
2016:
2014:
2013:Riparian zone
2011:
2009:
2006:
2004:
2001:
1999:
1998:Body of water
1996:
1994:
1991:
1989:
1986:
1985:
1983:
1979:
1973:
1970:
1968:
1965:
1963:
1960:
1958:
1955:
1953:
1950:
1948:
1947:Riverboarding
1945:
1943:
1942:River surfing
1940:
1938:
1935:
1933:
1930:
1928:
1925:
1924:
1922:
1918:
1912:
1909:
1907:
1904:
1902:
1899:
1897:
1894:
1892:
1889:
1887:
1884:
1882:
1879:
1877:
1874:
1872:
1869:
1867:
1864:
1862:
1859:
1857:
1854:
1852:
1849:
1847:
1844:
1842:
1839:
1837:
1834:
1832:
1829:
1827:
1824:
1822:
1819:
1817:
1814:
1812:
1809:
1808:
1806:
1804:
1800:
1794:
1791:
1789:
1786:
1784:
1781:
1779:
1776:
1774:
1771:
1769:
1766:
1764:
1761:
1759:
1756:
1754:
1751:
1749:
1746:
1744:
1741:
1739:
1736:
1734:
1731:
1729:
1726:
1724:
1721:
1719:
1716:
1714:
1711:
1709:
1706:
1704:
1701:
1699:
1696:
1694:
1691:
1689:
1686:
1684:
1681:
1679:
1676:
1674:
1671:
1670:
1668:
1666:and modelling
1662:
1656:
1653:
1651:
1648:
1646:
1643:
1642:
1640:
1638:
1634:
1628:
1627:Return period
1625:
1623:
1620:
1618:
1615:
1613:
1610:
1608:
1605:
1603:
1600:
1598:
1595:
1593:
1590:
1588:
1587:Flood control
1585:
1583:
1582:Flood barrier
1580:
1576:
1573:
1571:
1568:
1567:
1566:
1563:
1561:
1558:
1556:
1553:
1551:
1548:
1547:
1545:
1543:
1539:
1535:
1529:
1526:
1524:
1521:
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1214:Palaeochannel
1212:
1210:
1207:
1205:
1202:
1200:
1197:
1195:
1192:
1190:
1187:
1185:
1182:
1180:
1177:
1175:
1174:Granular flow
1172:
1170:
1167:
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1160:
1157:
1155:
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1150:
1147:
1145:
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1128:
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1059:
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921:
920:Channel types
918:
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908:
906:
903:
901:
900:Braided river
898:
896:
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866:
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847:
845:
840:
839:
836:
829:
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824:
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802:on 2008-06-25
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492:
489:
485:
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477:
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475:
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469:
465:
461:
451:
449:
448:North America
445:
444:Pacific Ocean
441:
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429:
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366:
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352:
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341:
338:
334:
331:
327:
324: –
323:
319:
318:Find sources:
312:
308:
304:
298:
297:
293:
288:This section
286:
282:
277:
276:
268:
266:
262:
258:
253:
249:
245:
241:
237:
232:
230:
226:
222:
218:
214:
213:Lake Victoria
208:
206:
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198:
194:
190:
186:
182:
178:
174:
170:
165:
163:
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155:
148:
147:
141:
138:A stone near
136:
127:
125:
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109:
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97:
93:
89:
85:
81:
77:
73:
69:
65:
61:
54:
50:
46:
40:
33:
19:
2071:Flash floods
2023:River cruise
1920:River sports
1773:Stream gauge
1758:Rouse number
1748:Relief ratio
1597:Flood-meadow
1528:Urban runoff
1442:Fluvial flow
1427:River valley
1397:River island
1362:Meander scar
1277:Alluvial fan
1219:Progradation
1094:Karst spring
1038:Winterbourne
993:Chalk stream
955:River source
954:
930:Distributary
827:
821:Bibliography
810:
804:. Retrieved
797:the original
783:
775:
769:. Retrieved
756:
747:
735:
726:
716:
708:the original
698:
673:the original
668:
659:
647:. Retrieved
631:
578:
567:
463:
459:
457:
425:
414:
399:
390:Rhume Spring
369:
360:
350:
343:
336:
329:
317:
301:Please help
289:
233:
221:Kagera River
216:
209:
166:
151:
143:
112:spring water
95:
59:
57:
1932:Fly fishing
1856:Fish ladder
1841:Daylighting
1560:Flash flood
1523:First flush
1470:Plunge pool
1194:Downcutting
1179:Debris flow
1154:Aggradation
1028:Stream pool
551: /
539:111°30′29″W
515: /
181:ephemerally
177:perennially
169:river mouth
72:tributaries
39:RiverSource
2096:Categories
2038:Wild river
1718:Hydrograph
1708:Hack's law
1673:Baer's law
1617:Inundation
1602:Floodplain
1542:stormwater
1500:Whitewater
1372:Oxbow lake
1209:Knickpoint
1184:Deposition
1077:Hot spring
1018:Streamflow
1008:Stream bed
925:Confluence
806:2008-05-30
771:2008-05-30
649:24 October
623:References
617:Water well
536:45°55′39″N
503:95°12′29″W
500:47°14′22″N
434:is at the
406:River Tees
363:March 2023
333:newspapers
205:confluence
130:Definition
92:confluence
53:Farringdon
2008:Limnology
1957:Triathlon
1927:Canyoning
1896:Revetment
1826:Check dam
1738:Main stem
1495:Waterfall
1382:Point bar
1367:Mouth bar
1307:Billabong
1254:Water gap
1249:Wash load
1229:Saltation
1149:Anabranch
1072:Holy well
960:Tributary
428:watershed
410:marshland
290:does not
171:) in the
124:main stem
108:meltwater
104:rainwater
60:headwater
49:River Wey
1811:Aqueduct
1678:Baseflow
1645:Effluent
1322:Cut bank
1287:Avulsion
1164:Bed load
1144:Abrasion
727:BBC News
591:See also
140:Crissolo
1988:Aquifer
1981:Related
1937:Rafting
1465:Meander
1460:Log jam
1422:Thalweg
1327:Estuary
1199:Erosion
1136:erosion
1048:Springs
1003:Current
970:Streams
910:Channel
873:springs
869:streams
454:Example
418:glacial
347:scholar
311:removed
296:sources
244:Madison
201:Montana
110:and/or
96:sources
90:or its
82:into a
80:estuary
1783:WAFLEX
1655:Sewage
1538:Floods
1480:Riffle
1475:Rapids
1417:Strath
1387:Ravine
1312:Canyon
1067:Geyser
998:Coulee
983:Bourne
978:Arroyo
881:Rivers
865:Rivers
585:inflow
464:linear
349:
342:
335:
328:
320:
225:Thames
193:Amazon
120:course
68:stream
1881:Levee
1866:Flume
1821:Canal
1565:Flood
1485:Shoal
1352:Gully
1347:Gulch
1317:Chine
1302:Bayou
1159:Armor
1111:Ponor
886:lists
800:(PDF)
793:(PDF)
744:(PDF)
640:(PDF)
581:lakes
460:river
402:marsh
396:river
394:Rhume
354:JSTOR
340:books
240:Clark
236:Lewis
229:Churn
102:from
76:mouth
64:river
62:of a
1911:Weir
1876:Leat
1540:and
1432:Wadi
1392:Rill
1357:Glen
1342:Gill
1292:Bank
1134:and
1099:list
1082:list
1053:list
988:Burn
871:and
651:2009
470:and
442:and
326:news
294:any
292:cite
246:and
238:and
217:into
197:Nile
152:The
84:lake
58:The
1831:Dam
1297:Bar
1272:Ait
421:ice
408:is
305:by
267:."
259:to
195:or
88:sea
66:or
2098::
867:,
809:.
774:.
764:.
746:.
725:.
681:^
667:.
642:.
587:.
482:.
458:A
450:.
423:.
412:.
146:Po
126:.
106:,
1055:)
1051:(
888:)
884:(
857:e
850:t
843:v
750:.
729:.
692:.
653:.
486:.
376:)
370:(
365:)
361:(
351:·
344:·
337:·
330:·
313:.
299:.
86:/
78:/
41:.
34:.
20:)
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