Lake Kutara

Lake Kuttara is a nearly circular caldera lake in Shiraoi, Hokkaidō, Japan. It is part of Shikotsu-Tōya National Park. The lake is recognized as having the best water quality in all of Japan. With a transparency of 19 metres, the lake ranks second to Lake Mashū according to the Ministry of the Environment.
  • Primary inflows: none
  • Primary outflows: evaporation
  • Basin countries: Japan
  • Surface area: 4.68 km² (1.81 sq mi)
  • Max. depth: 148 m (486 ft)
  • Shore length: 8 km (5.0 mi)
  • Surface elevation: 258 m (846 ft)
Data from: en.wikipedia.org