Two visitors to the Grand Prismatic Spring walk along the boardwalk suspended over the steaming hot spring waters.
A thick billow of steam rising from the volcanically heated water in the Grand Prismatic Spring area envelops a small rock formation that, if you squint, almost looks like a distant and mysterious island in the tropics.
The distant treeline is momentarily visible through the thick plumes of steam rising from the Grand Prismatic Spring.
