This is a guide to regional sites in Ohio which can be studied in regard to resource management; land use; the quality of air, water, soil; and reclamation. The first section of the guide includes brief descriptions of Ohio's natural features at the present time, accounts of past appearances and events, and predictions for the future. In the second section, essential background information is provided for each of the five major watersheds of Ohio, and broad environmental problems are cited and related to the biophysical environment. Detailed descriptions of a wide variety of sites in each region are provided. (DT)