Located in the Tiadaghton State Forest, the Black Forest Trail and it’s many side trails reside in Lycoming and Potter counties. The Black Forest Trail is a loop of 42 miles beginning and ending just north of Slate Run, PA. The Black Forest Trail gets its name from the dense hemlocks that once grew here, keeping the forest floor in an everlasting darkness. The trail is challenging with many steep ascents and descents. However, the vistas make it worth the effort.