The Spanish River is a brackish distributary river that forms part of the border between Baldwin and Mobile counties in Alabama. It is approximately 8 miles (13 km) long and is influenced by tides. It begins at the northernmost tip of Blakeley Island, where it diverges from the Mobile River, at 30.772°N 88.0222°W. From there it flows along the eastern edge of Blakeley and Pinto islands, and discharges into Mobile Bay south of Pinto Island, at 30.665°N 88.021°W.