Situated midway between Madison Junction and Mammoth this area has two parts to explore which offer a wide variety of thermal activities. The best of these is the Black Basin Trail. The trail takes about 2 hours and passes a number of excellent geysers. The first of these is Steamboat Geyser, which is the world’s tallest active geyser. It can erupt to more than 300 feet although eruptions are rare with years between activities.

Cistern Geyser is linked by underground channels to Steamboat Geyser. Cistern Geyser has a beautiful blue pool, however the run off areas offer colours ranging from cream to deep brown. The other geyser of note is Echinus Geyser, which regularly erupts every 35-90 minutes reaching a height of 40-60 feet. Echinus is the largest acid water geyser known. Other geysers of note are Veteran and Pork Chop. Green Dragon Spring is also an interesting thermal feature.