Again this is not strictly a lake but it is a stunning consequence of a volcanic eruption. Champagne Pool is a prominent geothermal feature within the Wai-O-Tapu geothermal area in the Bay of Plenty Region of the North Island of New Zealand.
The terrestrial hot spring is located about 30 km (20 mi) southeast of Rotorua and about 50 km (30 mi) northeast of Taupo. The name Champagne Pool is derived from the abundant efflux of carbon dioxide (CO2), similar to a glass of bubbling champagne.
The hot spring was formed 900 years ago by a hydrothermal eruption, which makes it, in geological terms, a relatively young system. Its crater is around 65 m (213 ft) in diameter with a maximum depth of approximately 62 m (203 ft) and is filled with an estimated volume of 50,000 m3 (1,800,000 cu ft) of geothermal fluid. The orange tinge around the edges is due to deposits of arsenic.