Adena sites are concentrated in a relatively small area - maybe 200 sites in the central Ohio Valley, with perhaps another 200 scattered throughout Wisconsin, Indiana, Kentucky, West Virginia and Pennsylvania, although they may once have numbered in the thousands.
The Adena were notable for their agricultural practices, pottery, artistic works and extensive trading network, which supplied them with a variety of raw materials, ranging from copper from the Great Lakes to shells from the Gulf Coast [REF].