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While not as well-known as Old Faithful Geyser or Grand Prismatic Spring, the features of the West Thumb Geyser Basin are among the most diverse and beautiful in Yellowstone National Park. From hot pools to offshore hot springs to sinter terraces to underwater explosion craters, the West Thumb is a fascinating natural laboratory. The West Thumb Geyser Basin (WTGB), along the southwest shore of the West Thumb Basin in western Yellowstone Lake, is one of Yellowstone’s most beautiful and interesting hot spring basins and is home to an impressive array of hot water features.