sentences:  The river rises from its headwaters in Sutton and Douglas at Manchaug Pond and flows east in a meandering path through a series of ponds (Manchaug, Stevens, Gilboa, Lackey, Whitins, just west of Whitinsville), and joins the Blackstone River in Uxbridge.The river was named for a hunter, named Mumford, at Mendon, who drowned in this river in the 17th century.This occurred before the towns through which this river flows were formed from Mendon.