(Illinois)
Spitler Woods State Natural Area is a 202.5-acre (81.9 ha) state park located adjacent to Mount Zion, Illinois. The state park is located within the Decatur, Illinois metropolitan area. The eastern two-thirds of the state park is a listed Illinois Nature Preserve noted for its old-growth forest grove of white oak and hickory. The park is managed by the Illinois Department of Natural Resources (IDNR). (Ref: https://en.wikipedia.org/wiki/Spitler_Woods_State_Natural_Area)