The Souhegan River is one of New Hampshire's premier fishing destinations, flowing approximately 34 miles from its headwaters in New Ipswich through Greenville, Wilton, Milford, Amherst, and finally to Merrimack where it joins the Merrimack River. As one of the largest tributaries to the Merrimack River, the Souhegan drains approximately 425 square miles of southern New Hampshire. The river's name is derived from Native American origins, variously translated as river of the plains, river of difficult portages, or waiting and watching place. The river offers diverse fishing opportunities with its varied water types including pocket water, technical glides, and deep pools. The New Hampshire Fish and Game Department stocks the river heavily each year, making it an excellent destination for both novice and experienced anglers seeking trout and other species.