Hanging Rock and Wabash Reef National Natural Landmark is a 400 million year old limestone deposit coral reef that rises 75 feet above the river that undercuts it to give it a hanging appearance; it has been designated as a National Natural Landmark, and it is open to the public,
Hanging Rock and Wabash Reef National Natural Landmark is a 400 million year old limestone deposit coral reef that rises 75 feet above the river that undercuts it to give it a hanging appearance; it has been designated as a National Natural Landmark, and it is open to the public,