Anemone Geyser, Dual geyser system in Upper Geyser Basin, Wyoming, United States.

Anemone Geyser is a geyser system with two separate vents, named Big Anemone and Little Anemone, located about 10 feet apart in the Upper Geyser Basin. The two features share underground plumbing connections that cause them to affect each other's eruption timing and behavior.

The geyser became part of Yellowstone when the park was established in 1872, marking the start of systematic study of the region's geothermal features. Over time, scientists have tracked how the two vents interact with each other, revealing much about geyser behavior.

The name comes from the anemone flower: the Hague Party gave it in 1904 because both pale yellow vents resemble the bloom. The pools hold smooth, round sinter, and the two vents sit about ten feet apart, sometimes seeming independent though their behaviour suggests a connection.

The site is near Old Faithful and accessible via marked trails through the geothermal area. Visitors should stay on designated paths and keep distance from the active vents, as the ground can be unstable and dangerously hot.

The name comes from the anemone flower, given by the Hague Party in 1904 because both pale yellow vents resemble the bloom. The two vents sit only ten feet apart and sometimes seem independent, yet their linked behaviour shows they share underground plumbing.