Sapphire Pool, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Sapphire Pool in the Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Turquoise clear water of a hot spring, Sapphire Pool, Black Sand Basin and Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Turquoise clear water of a hot spring, Sapphire Pool, Black Sand Basin and Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Sapphire Pool, Yellowstone National Park, Wyoming, USA, North America

Sapphire Pool, geyser, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Drainage area of the Sapphire Pool, geyser, coloured thermophilic bacteria, microorganisms, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Outlet with colourful thermophilic bacteria and algae of the Sapphire Pool in Bisquit Basin, Yellowstone National Park, Wyoming, Idaho, Montana, America, United States

Creek and pool in Biscuit Basin, Yellowstone National Park, Wyoming.

Sapphire Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

Black Opal Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

Sapphire Pool in Biscuit Basin, Yellowstone National Park, Wyoming.