The entire southern and most of the eastern borders of Ohio are formed by the Ohio River, which serves as a natural boundary between Ohio and West Virginia and Kentucky. This river flows westward into the Mississippi River and is a significant geographical feature in the region. Additionally, the eastern border is further defined by the alignment of the Ohio River and various tributaries.
Lake Erie forms the entire north border. The Ohio River forms the entire south border. There are no natural borders on the East or West borders of Ohio.
pot island
The Rio Grande
The Mississippi River forms Arkansas' eastern border.
The Ohio River forms the southern borders of Ohio and Indiana.
New BrunswickNew Brunswick forms the entire eastern border of Maine. Also of note is that Maine is the only US state that borders only one other state, which is New Hampshire.
The states of Iowa, Missouri, and Arkansas have their eastern borders on the Mississippi River. The Mississippi River borders seven other states.
The Atlantic Ocean forms the eastern and southern border of New England.
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
The Atlantic Ocean forms the eastern boundary of the Southeast, while the Gulf of Mexico forms the southern boundary.
Mississippi river
The Ohio River forms the borders of West Virginia, Ohio, Kentucky, Indiana, and Illinois. The border terminates at the confluence with the Mississippi and the border with Pennsylvania.