Photographs of Upper Geyser Basin, Yellowstone National Park

Catfish, Mastiff and Bijou are three geysers on the north side of the prominent cone of Giant Geyser, sharing a wide, low mound of ancient, grey-brown geyserite. All erupt regularly but also have periods of inactivity lasting a few hours; their behaviour is interconnected, and also affected by Giant Geyser. Bijou is longest lasting, sometimes performing for several hours, while Mastiff and Catfish are the largest, both on occasions exceeding 100 feet. All three drain eastwards into the Firehole River.

Back to map of the Upper Geyser Basin

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