The Ashuwillticook Rail Trail passes through the Hoosac River Valley, between Mount Greylock and the Hoosac Mountains. Cheshire Reservoir, the Hoosic River, and associated wetland communities flank much of the trail. The word Ashuwillticook (ash-oo-will-ti-cook) is from the American Indian name for the south branch of the Hoosic River and literally means at the in-between pleasant river, or in common tongue, the pleasant river in between the hills.