The Champagne Pool
This hot spring is found in an area known as the Waiotapu geothermal area on New Zealand’s North Island.
The hot spring sits in a crater 65 meters across and reaches temperatures of ~75℃. The vivid colors around the edge are produced due to elements that are dissolved in the hot waters as they travel through the ground.
The waters dissolve arsenic and antimony from the ground as they circulate. When they reach the edge of the pool and cool, those elements precipitate out of the water and form sulfide-rich minerals that give the reddish color. The name Champagne Pool derives from another dissolved compound, carbon dioxide, which dissolves in the water and bubbles up to the surface in the pond.
Image credit: Trey Ratcliff https://www.flickr.com/photos/stuckincustoms/4500083965