The Manasquan River is a 26.5-mile-long (42.6 km) waterway in central New Jersey. It flows from western Monmouth County, beginning in Freehold Township, near the headwaters for the Manalapan Brook and Millstone River systems in the Raritan Basin, and flowing to the Atlantic Ocean, where it empties between the communities of Manasquan and Point Pleasant via the Manasquan Inlet. It widens greatly as it nears the ocean, making it ideal for boating, and is a very popular recreational area of the Jersey Shore. The Manasquan River and Inlet is the unofficial northernmost terminus of the Intracoastal Waterway.