The Sudbury River is a scenic waterway located in eastern Massachusetts. It flows approximately 26 miles, starting from the town of Sudbury and eventually merging with the Assabet River to form the Concord River. The river is known for its natural beauty and recreational opportunities, including canoeing, kayaking, and fishing. The Sudbury River is part of the larger Sudbury River Watershed, which supports diverse wildlife and plant species. It is also significant for its historical importance, as it played a role in the early settlement of the region. The river is protected by various conservation efforts to maintain its ecological health.