Culberson Woods State Nature Preserve is located in Clinton County, Ohio, United States. It protects one of the largest remnants of the which once covered the uplands of the Till Plans of Ohio and Indiana. This type of swamp has poorly drained, white clay soil and is wet in the winter but dry in the summer. Culberson woods is open to the public, but it encompasses 40 acres (160,000 m2) with a 3 mile trail.