White Bluff, also known as Ecor Blanc, is a historic site located along the Tombigbee River not far from the city of Demopolis, Alabama. It is a chalk cliff, roughly one mile long. The upper portions of the cliff stood almost 80 feet (24 m) above the river before the construction of the Demopolis Lock and Dam downriver. It now averages about 30 feet (9.1 m) above the river. White Bluff was first named Ecor Blanc by 18th century French explorers and map makers.