The Merrimac River is a river located in northeastern United States, primarily flowing through the states of New Hampshire and Massachusetts. It stretches approximately 117 miles and is known for its scenic beauty and recreational opportunities, including fishing, kayaking, and hiking along its banks. The river originates from the White Mountains in New Hampshire and eventually empties into the Atlantic Ocean at Newburyport, Massachusetts. The Merrimac River has historical significance, as it played a role in the early industrial development of the region, particularly in cities like Lowell and Lawrence.