river flowing from NE Miss. through Ala., joining the Alabama River to form the Mobile River: 409 mi (658 km)
See Tombigbee in American Heritage Dictionary 4
(tŏm-bĭgˈbē)
A river, about 644 km (400 mi) long, rising in northeast Mississippi and flowing generally southward through western Alabama to join the Alabama River and form the Mobile River.