Temperature 170.2°F Dimensions 18x30 feet. Depth 16 feet. Dragon's Mouth is a turbulent hot spring with a cavernous mouth. Water sloshes rhythmically in and out of the cavern giving the impression of a large overflow; however, the actual discharge is quite small. Much of the activity and energy is located within the cavern. As hot water rises to the surface, hydrogen sulfide, carbon dioxide, and water vapor gases expand creating a pressure explosion in the cavern. The resulting activity is sloshing, belching, and steaming.