The Warren Woods State Park is a 311 acre park located in Berrien County, Michigan. Leased by private owners to the state of Michigan, it is located near the town of Three Oaks. The beautiful park is home to some of the rare climax beech-maple forest in the state of Michigan. There are other areas in the park is filled with other floodplain oak-hickory forests. However, many of the beech trees in the park are heavily scarred with hand carved graffiti; some of it are years old. Fortunately this hand carved graffiti making has declined in the recent years saving the delicate bark of the trees.

Due to the large size of the trees as well as its age, the Warren Woods State Park was declared a National Natural Landmark in 1967.