Champagne Pool is a prominent geothermal feature within the Waiotapu geothermal area in the North Island of New Zealand. 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. Its crater is around 65 m in diameter with a maximum depth of approximately 62 m and is filled with an estimated volume of 50,000 m3 of geothermal fluid. Waiotapu, also spelt Wai-O-Tapu (Māori for “sacred waters”) is an active geothermal area at the southern end of the Okataina Volcanic Centre, just north of the Reporoa caldera, in New Zealand’s Taupo Volcanic Zone. It is 27 kilometres south of Rotorua.