The Southeastern archaeological area has never been clearly defined but has tacitly been considered that part of North America south of the Ohio River and east of the Mississippi. By some archaeologists it has been thought a rather homogeneous culture area, but no other portion of the continent presents a more varied content. With several types of topography represented, it is logical that many kinds of aboriginal sites are to be found within its scope; the number of seemingly unrelated tribes that claimed this area as their home connotes a varied past. In early historic times it was one of the first sections of the continent to be explored by Europeans. In recent years intensive archaeological investigations have thrown new light on the history of the region and its inhabitants. Tremendous shell midden deposits along river and creek courses and on the Atlantic and Gulf coasts, rock shelters and caves showing occupation, and a few inland sites of demonstrable antiquity all indicate an earlier population entirely different from that encountered by the first visitors from Europe.