"White Bluff, also known as Ecor Blanc, is a historic site located along the Tombigbee River in Demopolis, Alabama, United States. It is a chalk cliff, roughly one mile long, that is composed of a geological layer known as the Demopolis Chalk Formation, part of the Selma Group. 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. It also became known as the Chickasaw Gallery because early Native American inhabitants harnessed their boats at the foot of the cliff. It was the site where French Bonapartist refugees landed in 1817 and established their Vine and Olive Colony" - Wikipedia
The bluff runs from north of the above posted coordinates (where historical marker for bluff is located) to south of N32 31.031' W87 50.681' where an undeveloped park is located. The bluff is visible from only a few vantage point from land is is most visible from the river.