The Ohio River forms the southern borders of Ohio and Indiana.
The Ohio River formed the southern border of the Northwest Territory.
Thames River in London Rachel
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.
The Rio Grande
straight across
The border is the Ohio River.
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The borders of US were from Georgia in the South to the Great Lakes in the Noth. The Mississippi River formed the western border.
The Ohio river is located on the southern boundary of Indiana and Ohio. The Ohio River also borders northern Kentucky.
The Narbada River
the columbia borders washington and oregon