Tennessee is separated from Arkansas by the Mississippi River.
The Mississippi River is the East boundary for Arkansas.
The Mississippi River is the border separating Tennessee and Arkansas.
The natural boundary that separates New Jersy from Pennsylvania is the Delaware river
Tien Shan Mountains
the equator...... i think
Fall Line :)
The Ural Mountains.
A reef or low island.
The Pyrenees Mountains.
The Rio Grande river. The Rio Grande, or Big Rivernew london
The national boundary that separates Oregon and Washington is the Columbia River. This river flows westward to the Pacific Ocean and serves as the natural border between the two states for much of their length. The boundary is defined by the river's mid-channel, which means that the border shifts slightly with changes in the river's course.
The Mississippi River forms a natural border between Mississippi and Louisiana to the west and flows along the eastern edge of Arkansas. It also serves as a boundary between Mississippi and Tennessee to the north. The river is a significant geographical feature in the region, influencing both the ecology and the economy.