Cliff Geyser erupting (11 August 2011) 16
Cliff Geyser is a frequently-erupting geyser in the Black Sand Basin of Yellowstone's Upper Geyser Basin. It sits on the banks of Iron Spring Creek. A small cliff of geyserite has formed between the creek and the geyser's pool. Eruptions are small to moderately large, moderately intermittent bursts from a low pool or an overflowing pool.