Camp Maple Swamp

Historical marker location:

218 North Main, Castine, Ohio

( Marker is on Main Street (U.S. 127) 0.2 miles north of U.S. 127, on the right when traveling north.)

Marker installed: 1936

The Ohio River, which forms the state's southern border, played a significant role in the Underground Railroad, a network of secret routes and safe houses used by African American slaves to escape to freedom in the North before the Civil War.