Sign in Yellowstone National park warning of geothermal features THIN CRUST AREA: For your safety and protection of fragile features STAY ON BOARDWALK.
NIKON CORPORATION NIKON D750, f/8 @ 38 mm, 1/60, ISO 100, No Flash
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Keywords:Environment, Post, Sign, Yellowstone National Park, caution, fragile, geology, geothermal, geyser, hot spring, safety, thermal, warning
