This body of water runs from the mountains of northeast georgia southward to form part of the georgia/alabama border, and flows out into apalachicola bay.

This body of water runs from the mountains of northeast Georgia southward to form part of the Georgia/Alabama border, and flows out into Apalachicola Bay is the Chattahoochee River.

Explanation:

The Chattahoochee is a river in the northeast of the US state of Georgia that runs through the western suburbs of Atlanta. At the point where the river joins the Flint River, it forms the Apalachicola.

In 1978 an important recreational area, Chattahoochee River National Recreation Area, was established. The Eufaula National Wildlife Refuge is a nature reserve established in 1964 with an area of 45.26 km² for, among other things, water birds. The nature reserve includes Walter F. George Lake, a reservoir in the river, on the border between the states of Alabama and Georgia.

its d i know cause i've been googling it