Belgian Pool

Overview

Belgian Pool is a small but eye-catching hot spring in the Upper Geyser Basin’s Sawmill Group. Despite its modest size, it often flashes vivid green-yellow or clear blue tones depending on temperature and microbial life. Like many features here, its water level can fluctuate with the basin’s ever-changing underground plumbing.

What You’ll See

Expect a deep, circular mouth of pale, clear blue water that spills west into a shallow apron edged with orange and brown microbial mats—subtle but photogenic. Midday light tends to bring out the colors; mornings and evenings trade color pop for atmospheric steam.

History and Safety

Originally known as Oyster Pool, it was informally renamed after a Belgian visitor, George Landoy, stepped onto fragile ground in 1929 and fell into the ~180°F water, later dying from his burns. It’s a stark reminder to stay on the boardwalks, keep kids close, and resist any urge to touch the water. Dogs aren’t permitted on boardwalks, and even “cool-looking” edges can be dangerously thin.

Getting There

Park at the Old Faithful/Upper Geyser Basin lots and follow the signed boardwalk network; Belgian Pool sits along the loop near other Sawmill Group features. Restrooms and services are clustered around the Old Faithful hub. No picnicking in thermal basins—use designated picnic areas along the Madison–Old Faithful corridor instead.

Best Time to Visit

• Midday for the strongest color; early morning or late afternoon for mood and steam.
• Arrive early to dodge the heaviest boardwalk crowds around Old Faithful.
• Sun can be relentless here—bring water, sun protection, and patience for passing tour groups.

Wildlife

Wildlife can occasionally wander through basin corridors; give animals ample space and don’t block the boardwalk. Your best sightings are more likely elsewhere, so consider this stop a quick thermal highlight rather than a wildlife spot.

Is It Worth It?

Yes—as a brief, visually pleasing stop on your Upper Geyser Basin circuit. It’s not a headliner, but the color and the poignant backstory make it memorable without costing you much time.