View Photo - Black Sand Basin Informational Sign - Photo

---

Black Sand Basin

Black obsidian (volcanic glass) "sand" gives this geyser basin its name. Oranges, greens, and other colors in and around the hot springs come from thermophiles (heat-loving micro-organisms). While you walk the trail, watch for one of Cliff Geyser's frequent eruptions. The fully accessible trail is about 1/4 mile (0.4 km) long.

[Main image labels - top to bottom]
Emerald Pool
Rainbow Pool
Cliff Geyser
Sunset Lake