The Okama Crater Lake at Mount Zaō, Japan

 

The Okama Crater Lake at Mount Zaō, Japan. According to Wikipedia, it is “also known as the ‘Five Color Pond’ because it changes color depending on the weather.” It “lies in a crater formed by a volcanic eruption in the 1720s. The lake is 360 meters (1,200 ft) in diameter and 60 m (200 ft) deep, and is one of the main tourist attractions in the area.” Photo by Laurenz Bobke