Kerid is a striking crater-lake filled with milky blue-green water amid stark black and deep red slopes. Once believed to be an explosion crater formed 3,000 years ago, geologists now believe it to be a collapsed magma chamber at the end of a volcanic eruption that occurred more than 6,000 years ago.

Kerid is 55 meters (180 ft) deep including the stagnant water on the bottom. There is a path lining the rim for visitors to walk around and view the red and black slopes contrasting with the aqua blue water.