Mount Minsi forms the Pennsylvania side of the Delaware Water Gap, where the Delaware River cuts through the ridge at the eastern end of Blue Mountain. Made of sandstone and conglomerates of the Shawangunk Formation, it has the hard rock that creates its steep eastern face. The mountain is a popular destination for hiking, with routes to the summit including the Appalachian Trail from near Delaware Water Gap and a fire road on the northwest slopes, both round trips of about 5 miles. Its eastern cliffs are also known for traditional climbing routes established beginning in 1975, including moderate, difficult, mixed, and winter ice climbs.