Mobile–Tensaw River Delta

The Mobile–Tensaw River Delta is the largest river delta and wetland in Alabama. It encompasses about 260,000 acres (110,000 ha) in a 40-by-10-mile (64 km × 16 km) area and is the second-largest delta in the contiguous United States. This large river delta is around 45 mi long and averages 8 mi wide, being 16 mi wide at its widest point. It covers roughly 300 sq mi. Of its 260,000 acres, 20,000 acres consist of open water, 10,000 acres are marsh, 70,000 acres are swamp; and more than 85,000 acres are bottomland forest. It drains an area of about 44,000 sq miles, which includes 64% of Alabama and small portions of Georgia and Mississippi.

The delta's northernmost point is the confluence of the Tombigbee and Alabama Rivers and follows a southerly direction that ultimately opens into the head of Mobile Bay through the Mobile, Tensaw, Apalachee, Middle, Blakeley, and Spanish Rivers near the Battleship Parkway. It is contained within sections of Baldwin, Clarke, Mobile, Monroe, and Washington Counties.