Ecoregions of North Dakota and South Dakota 104° 103° 102° 101° 100° 99° 98° 97° 96° 49° SASK 49° ATCHEWAN MANITOBA CANADA R UNITED STATES r e e d S iv R 42b 46h o bina R 49 u 46b Pem i r v is 46g 46a e 46g 48b r R Belcourt iv e 42 42d r 46d 46g 46g 46c D e s L ac s R River 42i iv 46d Park er 46d 46c 46c r e v Rugby i 48a er R iv Minot s R 42c ri st Williston 43c u Fore So 46d M iss 46f our 46f 48° i Riv Devils iver 48° er R Lake le rt u 42b 46f T 48c Grand Forks 43c Watford City 48b 48 43a Shey r 46i e e 46f n v Lake 46j n i e R 46f Sakakawea R e n i o v t e s r w 42b 46f o ll e r e M Y v i i 48b s s R 42a o i 43b u r 42c 48a r u i o R s i s v i Knife e A R 43c r M iv e 42b 46f N r e l A t t i T L N O 46f 51 47° M 47° Medora 42a Dickinson Jamestown Valley City Fargo 42a 42b H Mandan ear t Ri ver Bismarck R e d 46j R i C J v an a e no m r nb 43c 42a e a 43a s ll R R iv iv 48b er e r 46j O tter T Wahpeton ail River B o 43 i s 43c d 42c e 46e S i o 46° u Hettinger 42b x 46° R i v NORTH DAKOTA e 46d r 43d SOUTH DAKOTA 43d 46e 43d G 43a ran d River 43e Buffalo 42a Sisseton 43d Mobridge 43d 43a 43d Aberdeen M inn 43c 46o eso R ta 43j iver er Milbank M eau Riv 46l Mor I 46c N N E 45° 42f S 45° O T Watertown A 43f 46i 43k 46k Belle B i Fourche g 46 S i o 43a u x B Lake R e i l 43c v le Oahe e 46k r F r o ive 17a u R r ne c en 46m h hey e C R Deadwood iv er Brookings 17 Pierre Huron 43c 42f 43f Rapid City 17c 43g Lake Madison 44° Philip 43c 42f 44° Sharpe G N I r Bad Rive M O Custer Y J a m W 47a e 43c Chamberlain s 17b White River Mitchell R iv 46n e 43h r 42e Sioux Falls r Hot Springs e iv 43f R 47 e Winner it h W k Lake 43i r I o Francis O F 25a Case W h t 43e A u o 42h S 42g 42f 46k 43° 43 44a 42h 47a ° NEBRASKA Yankton Mis sou ri R Vermillion 43 43 ive 47d Niobrara r Lewis and River Clark Lake 42 25 44 46 Sioux City 104° 103° 102° 101° 100° 99° 98° INTERIOR—G EOLOG ICAL S U RVEY, RES TON, VIRG INIA—1998 97° 17 Middle Rockies 43 Northwestern Great Plains 46 Northern Glaciated Plains 47 Western Corn Belt Plains 17a Black Hills Foothills 43a Missouri Plateau 46a Pembina Escarpment 47a Loess Prairies 17b Black Hills Plateau 43b Little Missouri Badlands 46b Turtle Mountains 47d Missouri Alluvial Plain 17c Black Hills Core Highlands 43c River Breaks 46c Glacial Lake Basins 48 Lake Agassiz Plain 25 Western High Plains 43d Forested Buttes 46d Glacial Lake Deltas 48a Glacial Lake Agassiz Basin 25a Pine Ridge Escarpment 43e Sagebrush Steppe 46e Tewaukon Dead Ice Moraine 48b Sand Deltas and Beach Ridges 43f Subhumid Pierre Shale Plains 46f End Moraine Complex 48c Saline Area 42 Northwestern Glaciated Plains 43g Semiarid Pierre Shale Plains 46g Northern Black Prairie 42a Missouri Coteau 43h White River Badlands 46h Northern Dark Brown Prairie Level III boundary County boundary 42b Collapsed Glacial Outwash 43i Keya Paha Tablelands 46i Drift Plains Level IV boundary State boundary 42c Missouri Coteau Slope 43j Moreau Prairie 46j Glacial Outwash International boundary 42d Northern Missouri Coteau 43k Dense Clay Prairie 46k Prairie Coteau SCALE 1:1 500 000 42e Southern Missouri Coteau 46l Prairie Coteau Escarpment 42f Southern Missouri Coteau Slope 44 Nebraska Sand Hills 15 10 5 0 30 60 mi 44a Nebraska Sand Hills 46m Big Sioux Basin 42g Ponca Plains 46n James River Lowland 30 20 10 0 60 120 km 42h Southern River Breaks 46o Minnesota River Prairie Albers equal area projection 42i Glaciated Dark Brown Prairie Standard parallels 44° N and 48° N.