The topographic maps are on the scale of 330 pixels/mile.
Cantwell Cliffs is physically separated from the rest of Hocking Hills State Park and Hocking State Forest. Those maps are here.
The boundary of the state park/forest is marked by a yellow dotted line. The Crane Hollow State Nature Preserve is marked by an orange dotted line. This boundary information is taken from the Hocking County Tax Maps.
Official ODNR websites: