Nescopeck Mountain forms a water gap with Catawissa Mountain. Catawissa Creek cuts through this water gap. There is also a water gap carved by Nescopeck Creek through Nescopeck Mountain. Both of these water gaps are relatively narrow. The mountain serves as part of the dividing line between the Susquehanna River and the Lehigh River watersheds. For some distance, the ridge runs parallel to the Susquehanna River at a distance of .