The Map Library and GIS products are part of the Ohio Coastal Atlas suite of mapping resources developed to provide coastal decision-makers, professionals, educators, interest groups and the public with information about Lake Erie and its watershed. Maps, graphics and information below focus on the Great Lakes.

Maps which have been created by the OCM and used in various OCM applications and/or created for our partner agencies' needs are available below to download as PDF files. An interactive map viewer with many data layers is accessible by selecting "Create." Topic-specific, interactive Use Case Map Viewers is accessible by selecting "Expand."

For additional and/or higher resolution maps, please contact the Office of Coastal Management

GL1 – Great Lakes Watershed
Illustrates the six major sections of the Great Lakes Watershed and major coastal population centers in the United States and Canada; also provides facts and figures for each Great Lake.