25 Western High Plains25a Pine Ridge Escarpment25b Rolling Sand Plains25c Moderate Relief Rangeland25d Flat to Rolling Cropland25e Rolling Cropland and Range25f Scotts Bluff and Wildcat Hills25g Sandy and Silty Tablelands25h North and South Platte Valley and Terraces

26 Southwestern Tablelands26a Cimarron Breaks26b Flat Tablelands and Valleys

27 Central Great Plains27a Smoky Hills27b Rolling Plains and Breaks27c Great Bend Sand Prairie27d Wellington-McPherson Lowland27e Central Nebraska Loess Plains27f Rainwater Basin Plains27g Platte River Valley

28 Flint Hills28 Flint Hills

29 Central Oklahoma/Texas Plains29a Cross Timbers

39 Ozark Highlands39a Springfield Plateau

40 Central Irregular Plains40b Osage Cuestas40c Wooded Osage Plains40d Cherokee Plains

42 Northwestern Glaciated Plains42g Ponca Plains42h Southern River Breaks42p Holt Tablelands

43 Northwestern Great Plains43g Semiarid Pierre Shale Plains43h White River Badlands43i Keya Paha Tablelands43r Niobrara River Breaks

44 Nebraska Sand Hills44a Sand Hills 44b Alkaline Lakes Area44c Wet Meadow and Marsh Plain44d Lakes Area

47 Western Corn Belt Plains47d Missouri Alluvial Plain47h Nebraska/Kansas Loess Hills47i Loess and Glacial Drift Hills47j Lower Platte Alluvial Plain47k Northeastern Nebraska Loess Hills47l Transitional Sandy Plain

Level III ecoregionLevel IV ecoregionCounty boundaryState boundary

104° 103° 102° 101° 100° 99° 98° 97° 96° 95°

103° 102° 101° 100° 99° 98° 97° 96° 95°

37°

38°

39°

40°

41°

42°

43°

37°

38°

39°

40°

41°

42°

43°

47k

47l

47j

47d

47i

47h

28

40b

40c

27a

27b

27f

27g

27e

44a

44a

44c44b

44d 44d

42p

42h42g43i

43r

25d

43g43h

25g

25h

25f

25f

25f

25c25h

25d

25b

25b 25c

25d

25c

25d

25d

25b

25e

26a26b

27c

27d

29a39a

44d

44d

43h

25a

25c

25c

25c 25b

25b

25b

25b

25d

25d

25d25d

42g

47d

4029282727 26

25 43

44

43 4246

47

4025

26

21

25

44a

26b 26a

3925b

26b26b

26b

25d

40d

Niobrara River

Sou

th Pla

tte Rive

r

North Platte Ri ver

Republican River

Saline River

Dismal River

Middle Loup River

White R

iver

Arkan

sas R

ive

r

Kansas River

Cimarron River

South Fork Republican River

Platte River

Smoky Hill River

So ut h Fork Elkhorn

Nort h Loup River

Nort h Fork Cimar

ron

Rive

r

Missouri River

Missou r i River

South Loup River

Loup River

Pl a tte River

West Fork Big B lue River

Big B

lue River

M

i ssouri Ri ver

North Fork Elkhorn

Elkhorn River

Medic ine Lodge River

James River

Ma ra

is des Cygnes River

Big

Sio

ux R

iver

Verdigris River

Cimarron River

Elkhorn River

Spri

ng

R

iver

South Fork White R iver

Little Arkansas R

iver

Wal

nut

Riv

er

South Fork Solomon RiverSolom

on R iver

North Fork Big Nem

aha River

Little Nemaha River

Neosh o R

iver

North Fork Solomon River

S F

k B

ig N

emaha River

Calamus River

North Loup River

Ninnescah River

LakeMcConaughy

CalamusReservoir

CheyenneBottoms

Lewis andClark Lake

Topeka

Wichita

Lincoln

Atchison

Dodge CityEl Dorado

Emporia

Fort Scott

Garden City

Goodland

GreatBend

Hays

Hutchinson

Independence

Lawrence

Leavenworth

Liberal

Manhattan

McPherson

Pratt

Salina

Alliance

Beatrice

Chadron

Columbus

FallsCity

Fremont

GrandIsland

Hastings

Kearney

LoupCity

McCook

North Platte

Valentine

Omaha

MedicineLodge

Scottsbluff

KansasCity

ThedfordNorfolk

Nebraska City

O'NeillSouth Sioux City

Sidney

NEBRASKA

KANSAS

SOUTH DAKOTA

WY

OM

ING

CO

LO

RA

DO

IOWA

MISSOURI

NEW MEXICOOKLAHOMA

Ecoregions of Nebraska and Kansas

IN T E R IOR —G E OLOG ICA L S U R V E Y , R E S T ON , V IR G IN IA —2001