The Salmon Falls River is a tributary of the Saco River located in the northeastern United States. It flows through parts of Maine and New Hampshire, covering a distance of approximately 20 miles. The river is known for its scenic beauty and diverse ecosystems, making it a popular spot for outdoor activities such as fishing, kayaking, and hiking. The river's name is derived from the historical presence of salmon in its waters, which were once abundant. Today, the Salmon Falls River is also significant for its role in local history and industry, with several mills and dams built along its banks in the past.