The Nashua River is a 38-mile-long river located in the northeastern United States, primarily flowing through the states of New Hampshire and Massachusetts. It originates from the confluence of the Merrimack River and the Nashua River in the town of Nashua, New Hampshire, and eventually joins the Merrimack River. The river is known for its scenic beauty and recreational opportunities, including fishing, kayaking, and hiking along its banks. The Nashua River Watershed is an important ecological area, supporting diverse wildlife and plant species, and plays a crucial role in the local environment and economy.