Clepsydra Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.

Clepsydra plays nearly continuously to heights of 45 feet (14 m).

[3] It was named by T. B. Comstock during the 1878 Captain Jones expedition,[4] with its nomenclature derived from the Greek word for water clock.

Prior to the 1959 Hebgen Lake earthquake, it erupted regularly every three minutes.

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