A river shaped by an ancient eruption
The cataclysmic eruption of Mt. Mazama that created Crater Lake 7,700 years ago buried this land under pumice, ash, and lava. Over the millennia the Rogue River has carved its way back through, thundering through hard basalt lava and pumice canyons at Rogue Gorge and Takelma Gorge, disappearing underground through ancient lava tubes at Natural Bridge, and dropping off numerous waterfalls along the way. You run through that geology directly.