The Peribonka River is a river emptying in Sainte-Monique, in Lac-Saint-Jean-Est Regional County Municipality, in the Saguenay-Lac-Saint-Jean area in Quebec, Canada. It is 451 kilometres (280 mi) long and drains an area of 28,200 square kilometres (10,900 sq mi). It drains into Lac Saint-Jean at Pointe-Taillon National Park and is the largest tributary of this lake. The town of Péribonka is located on the north shore of Lac St-Jean at the river's mouth.