Frying Pan Lake
Frying Pan Lake at Waimangu is one of the world’s largest hot pools: 38,000 square metres in area, and fed by numerous acid springs. The lake fills part of a crater formed by the 1886 Tarawera eruption. It has a flat floor, mainly about 6 metres deep, although some vents are up to 20 metres deep. Lake temperature is generally between 45 and 55°C.
Rotorua, New Zealand
(PS: the photo does not do it justice!)