Southeast of Prattsville hamlet, NY 23A splits off from NY 23 to continue along Schoharie Creek while the latter climbs in elevation again along Batavia Kill. Shortly past Red Falls, all crossings of the creek come to mark the Blue Line that delineates the Catskill Park. The route remains to the north of the creek even as it passes the Windham Mountain ski area and NY 296 comes in from the south. However, it crosses it several times and is within the park as it reaches its highest point, at the pass next to Windham High Peak where the Long Path crosses the road. From here, NY 23 begins a long descent down the Catskill Escarpment, losing most of the elevation it had gained since leaving Oneonta. As it does so, the route provides sweeping, panoramic views of the Capital District and points north, east and west. Along this stretch is Five State Lookout, a vista providing views of five states and four mountain ranges, including the Adirondack foothills and Green Mountains in Vermont.