The Assabet River is a 30-mile-long river located in central Massachusetts. It flows through several towns, including Marlborough, Hudson, and Concord, before joining the Sudbury River to form the Concord River. The river is known for its scenic beauty and is a popular spot for recreational activities such as kayaking, fishing, and hiking along its banks. The Assabet River is part of the larger Assabet River National Wildlife Refuge, which protects the diverse ecosystems surrounding the waterway. This refuge provides habitat for various wildlife species and offers opportunities for birdwatching and nature walks, making it an important area for conservation and outdoor enjoyment.