 The river rises in Reading, flows roughly south through Woburn and Winchester, and empties into the Mystic Lakes.It is generally small and heavily channelized, often running through underground culverts, but is quite apparent in Winchester center where it widens into Judkins Pond and the Mill Pond.The river's 25 square mile watershed covers most of Woburn and about half of Winchester, as well as portions of the surrounding communities of Lexington, Burlington, Wilmington, Reading, Wakefield, and Stoneham.