Side A: Nearly 90% of Ohio’s wetlands have been drained or filled. Kettle holes, sphagnum peat bogs, prairies, and oak openings are still found in a few glaciated areas in the northern half of the state. Coastal areas along Lake Erie and bottomlands along Ohio’s rivers and streams preserve the remaining wetlands. Once a commercial fur farm, Spring Valley Wildlife Area exhibits the abundance of waterfowl and other wildlife common in wetlands, brushlands, and upland forest areas. More than 230 species of birds have been recorded here.