Sullivan County, New York brings together quiet river valleys, old canal paths, and the western edge of the Shawangunk highlands. Hike the Tusten Mountain Trail Loop for Delaware River views, follow the D and H Canal Linear Park Towpath Trail through the county’s industrial past, or head onto the Shawangunk Ridge Trail - Long Path for long, open miles. Around Mongaup River and Crystal Lake, the landscape feels gentler but no less rewarding.