Sulphur Spring, geyser in Yellowstone National Park, Wyoming, United States

Sulphur Spring, also called Crater Hills Geyser, is a geyser in the Crater Hills area of Hayden Valley, about 1 mile (1.6 km) west of the Grand Loop Road. Its vent reaches 89 °C (192 °F), while the spring water itself measures 79.8 °C (175.6 °F).

Sulphur Spring lies in the Crater Hills of Hayden Valley, about 1 mile (1.6 km) west of the Grand Loop Road. Its vent reaches 89 °C (192 °F), while the spring water itself measures 79.8 °C (175.6 °F). The feature is also known as Crater Hills Geyser.

Sulphur Spring lies in the Crater Hills of Hayden Valley, about 1 mile (1.6 km) west of the Grand Loop Road. Its vent reaches 89 °C (192 °F), while the spring itself measures 79.8 °C (175.6 °F). The feature is also called Crater Hills Geyser, a name visitors may meet on older maps of the valley.

Visitors should keep at least 25 feet (7.6 meters) away from the spring's edge because the water is extremely hot and the ground is unstable. It is best to explore the area on foot and exercise caution, especially if the ground is wet or icy.

Sulphur Spring is also known as Crater Hills Geyser, and its vent reaches 89 °C (192 °F) while the spring itself measures 79.8 °C (175.6 °F). It sits in the Crater Hills of Hayden Valley, about 1 mile (1.6 km) west of the Grand Loop Road.