the river that separates demerara from essequibo, is the boerasirie river (in guyana)
The river that separates Gaul and Italy is the Rubicon.
The Hudson River separates Manhattan from New Jersey.
topographic
by deforestation
A river, mountain, canyon, ocean, or any other geographical feature that separates two regions. This can also be man-made buildings and structures.
There is no river - the Bering Strait separates Alaska and Russia. It simply separates North Amercia and Asia.
That would be the Columbia River. This river separates approximately two thirds of southern Washington from northern Oregon. At a place on the 46th parallel north this river total enters the state of Washington, and this parallel becomes the border line that separates the two states.
The Colorado River separates it.
The Hudson River.
The Red River!
The Mississippi river