which mountainous landscape region divides the mississippi river drainage basins from the atlantic coastal plains drainage area

The Eastern Continental Divide is a series of mountainous landscape dividing the Mississippi Drainage basin from draining into the Atlantic Plains. This line separates water flow between the Atlantic Ocean and the Pacific Ocean. This divide is responsible for snow and rain getting drained, in the east into the Atlantic Ocean and in the west to the Pacific Ocean.

Explanation:

Starting from northwest to Canada this divide runs up to New Mexico cresting along the Rocky Mountains in the middle.

The Atlantic, Indian, Pacific, Arctic oceans and the Mediterranean sea hold numerous continental divides.

Endorheic Basins are continental divides that do not lead to or have any outflow into other water bodies.