Sapphire Pool, located at Biscuit Basin, is a bright blue pool and considered one of the most beautiful pools in Yellowstone. The bright blue color means that the temperature is very high. Safety railings and signs keep visitors at a safe distance. Following the 1959 Hebgen Lake Earthquake, it erupted, blowing away biscuit-like deposits around the pool which originally gave Biscuit Basin its name. The Old Faithful area is about one hour on foot. If you drive, it's just 10 minutes away. On a hot summer day, it's a good idea to go by car.
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