The Sudbury River Watershed is a natural area in eastern Massachusetts that encompasses the Sudbury River and its tributaries. This watershed covers parts of several towns, including Sudbury, Wayland, and Concord. It plays a crucial role in the local ecosystem, providing habitat for various wildlife and supporting plant life. The watershed is also important for water supply, recreation, and flood control. It feeds into the Assabet River, which eventually flows into the Merrimack River. Conservation efforts are in place to protect the watershed's health and ensure sustainable use of its resources.