According to Patricia Galloway, the Choctaw region of Mississippi, generally located between the Yazoo basin to the north and the Natchez bluffs to the south, was slowly occupied by Burial Urn people from the Bottle Creek Indian Mounds area in the Mobile, Alabama delta, along with remnants of people from the Moundville chiefdom (near present-day Tuscaloosa, Alabama), which had collapsed some years before. Facing severe depopulation, they fled westward, where they combined with the Plaquemines and a group of "prairie people" living near the area. When this occurred is not clear. In the space of several generations, they created a new society which became known as Choctaw (albeit with a strong Mississippian background).