Saranac River is an 81-mile-long (130 km) river in the U.S. state of New York. In its upper reaches is a region of mostly flat water and lakes. The river has more than three dozen source lakes and ponds north of Upper Saranac Lake; the highest is Mountain Pond on Long Pond Mountain. In the last third of its length it drops two-thirds of its total drop, and is known for having navigable rapids, which make it a popular site for whitewater kayaking and canoeing. The river is also part of the 740-mile Northern Forest Canoe Trail, which begins in Old Forge, NY and ends in Fort Kent, ME.