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String together an impressive collection of thermal features on this 1.7-mile loop in Yellowstone National Park's Norris Geyser Basin.This 1.7-mile lasso loop in Norris Geyser Basin visits the ever-changing thermal features of Back Basin. Boasting the hottest thermal landscape in Yellowstone National Park, this area of bubbling caldrons is a memorable stop on your park tour. From the parking area, head west to the Norris Geyser Basin Museum. At the museum, take the left-most path downhill, then veer left at the next junction to enter the stark expanses of Back Basin. Read more trail details, download GPS coordinates, and see short video clips of bubbling springs at backpacker.com/hikes/300076.