Black Pool at the West Thumb Geyser Basin is one of the most beautiful pools in Yellowstone National Park. It is bright blue in color with steam rising from its hot surface. It got its name when it was actually black. Until 1991 water temperature in this pool was lower so that it was inhabited by dark green and brown thermophiles, which gave the pool black appearance. Water temperature rose in 1991, followed by several eruptions, which made it too hot for thermophiles. Today, the feature is quiet and a popular attraction. The Abyss Pool is 53 feet deep and is one of the deepest hot springs in the park. It was named in 1935 by Chief Park Naturalist C.M. Bauer. It has sloping walls that vary in color from turquoise blue to green and brown. The attraction has gone through two active periods. It erupted in 1987 and several times in 1991/1992. Since that time, it has been quiet.

Rating: ⭐⭐⭐⭐⭐

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