Ripogenus Gorge is a rock-walled canyon formed in Maine where the West Branch Penobscot River intersects the Caribou Lake anticline.

The gorge provides an unusual exposure of Maine North Woods bedrock typically covered by saturated glacial till.

[1] Spruce forests along the west branch were harvested through the 19th century with logs floated through the gorge to sawmills as far downstream as Bangor, Maine.

Pulpwood was sluiced over the dam until 1971 when Great Northern Paper Company began trucking the lumber to the mill via the Golden Road.

Rafts and kayaks navigate between rock cliffs through colorfully named Exterminator Hole (IV), Staircase (IV), Fist of God, Big Heater, Little Heater, Troublemaker Hole (III+), Cribworks (V), Turkey Chute, Final Chute, Postage Stamp Rock, and Bonecruncher (III).