The Wallowas have been called America's Little Switzerland, and in fact their mix of granite, marble, and other metamorphosed rock does resemble the Alps geologically. The oldest rocks in the Wallowas began as sediment from a volcanic archipelago of islands in the early Pacific Ocean 250 million years ago. Upwelling basalt caused the Pacific seafloor to spread, gradually rafting the islands to the ocean's edges. Part of the island chain ended up smashed against early Eurasia, and part wound up here, buckled up against the edge of North America. Later additions to the continent left the Wallowas stranded 300 miles inland.
Group size is limited to six.
Backpackers should note that camping is banned within 200 feet of any lake. Campers are not allowed to cut firewood from standing trees, alive or dead. Downed firewood is scarce, so be sure to bring a camp stove. You'll need a Trail Park permit to park at the trailhead. They're available at most Forest Service offices and outdoor stores.