The Lillinonah Trail is a 5.9-mile (9.5 km) Blue-Blazed hiking trail "system" in the lower Housatonic River valley in Fairfield County and, today, is entirely in Newtown. Most of the trail is in the upper block of Paugussett State Forest. The mainline (official "Blue-Blazed") trail circles the Paugussett State Forest "upper block". The west, north and east portions of the trail are shared with the northern section of Al's Trail—a ten-mile trail in Newtown. The Lillinonah Trail today is composed of four sides in a square "loop".