Much of this watershed is covered by (from downstream to upstream) Lower and Upper Richardson Lakes, Mooselookmeguntic Lake, Cupsuptic Lake and Rangeley Lake. The major tributaries of this system are the Cupsuptic, Kennebago and Rangeley rivers, all of which flow into Cupsuptic Lake.
The majority of this watershed includes Lower and Upper Richardson Lakes, Mooselookmeguntic Lake, Cupsuptic Lake, and Rangeley Lake. The major tributaries in this system are the Cupsuptic, Kennebago, and Rangeley rivers, all flowing into Cupsuptic Lake.