But underneath that beautiful appearance can be an environment capable of causing severe or fatal injuries.
Some thermal waters can reach temperatures near or above the boiling point of water at Yellowstone's elevation.
The temperature can also vary dramatically between different areas of the same thermal feature.
That means you cannot reliably judge safety by looking at the water.
You cannot assume that a calm surface means a safe temperature.
And you certainly should not put a hand, foot, or any other part of your body into a thermal feature to find out.
The Ground Can Be Dangerous Too
The water isn't the only hazard.
The ground around geothermal features can be fragile.
Yellowstone's thermal areas contain thin crusts and unstable surfaces over extremely hot water and steam.
A person who leaves a designated boardwalk may believe they are simply walking across ordinary soil.
In reality, the surface may not be strong enough to support their weight.
