The Champagne Pool
Wai-O-Tapu geothermal area, near Rotorua, New Zealand. The pool gets its name from the tiny bubbles of carbon dioxide gas that constantly rise to its surface, similar to a glass of champagne.
There is also a vivid ring of orange around the pool formed by metalloid compounds within the water. The surface of the pool is a constant 73°C, so a bit warm for a dip.