Wesselman Woods Nature Preserve is a 240-acre (0.97 km2) nature preserve located in Evansville, Indiana. It is a National Natural Landmark and a State Nature Preserve owned by the City of Evansville and operated by the non-profit Wesselman Nature Society. The oldest trees are over 400 years old. Among the largest of their species are 24 state champions and two national champion trees. One of the tallest trees in the state is a tulip poplar located within the park. It is 147 feet (45 m) tall with a 13.2-foot (4.0 m) circumference and 81-foot (25 m) canopy.