Grand Prismatic Spring, Yellowstone's largest hot spring, is 200-330 feet in diameter and more than 121 feet deep. Limited parking, especially 10 am-6 pm. Located in Midway Geyser Basin.
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1. Norris Geyser Basin, Yellowstone. This tallest geyser in the world set the highest temperature ever recorded in the park. It's so far above sea level that the boiling point is 199°F rather than the sea-level 212°, but a hole drilled by scientists to 1,087 feet deep found a temperature of 459°F.
The third largest spring in the world, the Grand Prismatic is bigger than a football field at 370 feet in diameter. A gridiron is 360 feet long and 160 feet wide. The hot spring has bright bands of orange, yellow, and green ring the deep blue waters in the spring.
The Abyss Pool has a depth of up to 53 feet, according to the National Park Service. It has a temperature of approximately 140 degrees Fahrenheit. Water in these hot springs can “severely burn” visitors, the service warns on its website.
Frying Pan Lake (renamed Waimangu Cauldron in 1963 though not widely used) is the world's largest hot spring. It is located in the Echo Crater of the Waimangu Volcanic Rift Valley, New Zealand and its acidic water maintains a temperature of about 50 to 60 °C (122–140 °F).
— Yellowstone National Park said on Friday it's investigating a death related to part of a foot, in a shoe, found floating in a hot spring in the southern part of the park this week. Tuesday's discovery at Abyss Pool led to the temporary closure of the West Thumb Geyser Basin and its parking lot.