Belgian Pool, Hot spring in Upper Geyser Basin, Yellowstone National Park, US.
Belgian Pool is a circular hot spring in the Upper Geyser Basin with pale blue water filling its center. Westward from the main vent, orange and brown algae formations spread across the shallower areas.
The spring gained its name from a tragic 1929 incident when a Belgian visitor fell into the hot water and suffered severe burns. This event left a lasting mark on how the place is remembered.
The spring is part of the wider collection of thermal features in the park that reveal how underground heat shapes the landscape. Visitors can observe how water temperature and mineral content create the specific colors and organisms found here.
The spring sits at high elevation and the water reaches about 82°C (180°F). Visitors should keep a safe distance from the edge and stay on marked pathways around the feature.
The pool remains cooler than neighboring hot springs, allowing specific algae species to thrive in its shallow western section. This temperature difference creates a distinct biological community not found elsewhere nearby.
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