Biscuit Basin, Yellowstone National Park, Wyoming

Biscuit Basin is an isolated thermal group of interesting geysers and hot springs and is part of the Upper Geyser Basin in Yellowstone National Park, Wyoming. It drains into the Firehole River. Biscuit Basin is a couple of miles north of the famous Old Faithful Geyser. Biscuit-like sinter deposits once lined the edge of Sapphire Pool's crater in Biscuit Basin, and in the 1880s it received its name for the knobby formations. The 1959 earthquake caused Sapphire to erupt, breaking and dislodging the formations. Geologic upheavals continue in the area. A hydrothermal explosion happened around 10 a.m., July 23, 2024, in Biscuit Basin, so Biscuit Basin was closed to visitors for the rest of the summer. Similar blasts have happened in Biscuit Basin in 2009, 1991 and after the magnitude 7.2 Hebgen Lake earthquake 40 miles (64 kilometers) away in 1959.