Merrimack River. The Merrimack River is a 117-mile-long river in the northeastern United States.
   It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Gulf of Maine at Newburyport. From Pawtucket Falls in Lowell, Massachusetts, onward, the Massachusetts-New Hampshire border is roughly calculated as the line three miles north of the river.
   The Merrimack is an important regional focus in both New Hampshire and Massachusetts. The central-southern part of New Hampshire and most of northeast Massachusetts is known as the Merrimack Valley.
   Several U.S. naval ships have been named USS Merrimack and USS Merrimac in honor of this river.
   The river is perhaps best known for the early American literary classic A Week on the Concord and Merrimack Rivers by Henry David Thoreau. The Merrimack River in Pembroke, New Hampshire The Merrimack as it flows from Haverhill to its mouth in Newburyport, Massachusetts The etymology of the name of the Merrimack River-from which all subsequent uses derive, such as the name of the Civil War ironclad-remains uncertain. There is some evidence that it is Native American. In 1604 the natives of later New England told Pierre Dugua, Sieur de Monts, who was leading a colony of French language speakers to Acadia, of a beautiful river to the south. Th
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