Supplements: The Lackawaxen River is a 31.3-mile-long tributary of the Delaware River in northeastern Pennsylvania in the United States. The river flows through a largely rural area in the northern Pocono Mountains, draining an area of approximately 598 square miles. Its source is in the borough of Prompton in western Wayne County, at the confluence of the We ... (Read more) The Lackawaxen River is a 31.3-mile-long tributary of the Delaware River in northeastern Pennsylvania in the United States. The river flows through a largely rural area in the northern Pocono Mountains, draining an area of approximately 598 square miles. Its source is in the borough of Prompton in western Wayne County, at the confluence of the West Branch and Van Auken Creek. It flows past Honesdale and Hawley, where it is joined from the southwest by Wallenpaupack Creek. It continues east and joins the Delaware at Lackawaxen. East of Honesdale, it was deepened as part of the Delaware and Hudson Canal project. The river is a popular destination for canoeing and recreational fly fishing for trout. It was reportedly where the American author Zane Grey first learned to fly fish.