Sentinel Meadows is the location of one of Yellowstone’s lesser known thermal features, about 2 miles from the Firehole River. The meadow is mostly level, humid grassland and is home to several white and fairly large geyser cones topped by a bubbling spring. There is also a number of smaller hot pools, many of which are surrounded by an expanse of terraces and various sinter formations. The trailhead can be found on the Fountain Flats Road and the trail runs along the Firehole River. Keep an eye out for bison and elk. The trail goes along the valley edge, and to get closer to the geysers, you have to get off trail for a while. The ground is marshy and the trail often crosses small brooks and streams and passes by hidden hot vents, so tread carefully when off-trail.

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