With a diameter of 60 feet, Beauty Pool
is perhaps the largest spring in the Upper Geyser Basin, and one of the prettiest, filled with clear, greenish blue water and edged by a wide band of orange and brown cyanobacteria, which extends almost to the boardwalk trail. The pool has an underground connection to nearby, similarly colored Chromatic Spring
, and their water levels have an inverse relationship. The temperature also fluctuates, but like the water levels, this happens over a long period, of weeks to months.
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