straight across
Ohio River
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ohio
The Wabash River serves as part of the southern dividing line between Illinois and Indiana.
Pulaski County, Illinois is located along the Ohio River in southern Illinois.
The Wabash River forms the southern portion of Indiana's western border. The northern portion of Indiana's western border is simply a straight line marked on the map. The southern border of Indiana is also a river - the Ohio.
Illinois
The Columbia River borders most of the length between Washington & Oregon.
The Southern part of the Nile river churns with cataracts.
Red river is part of Oklahoma's southern border.
They are 8 of the 10 states whose borders include the Mississippi River. Iowa and Missouri (and Arkansas) are on the west bank. Wisconsin, Illinois, Tennessee, Mississippi (and Kentucky) are on the east bank. The river runs through Minnesota and Louisiana as well as forming part of their eastern borders.
The state of Alaska borders western Canada. Alaska is a part of the USA.