Lake Kuttara

Lake Kuttara
倶多楽湖 (Japanese)
View from the crater rim (August 2017).
Lake Kuttara
Coordinates	42°30′N 141°10′E / 42.500°N 141.167°E / 42.500; 141.167 [1]
Type	oligotrophic crater lake
Primary inflows	none [1]
Primary outflows	evaporation [1]
Basin countries	Japan
Surface area	4.68 km2 (1.81 sq mi)
Max. depth	148 m (486 ft)[1]
Shore length1	8 km (5.0 mi)[2]
Surface elevation	258 m (846 ft) [1]
Islands	none [1]
Settlements	Shiraoi[1]
References	[1]
1 Shore length is not a well-defined measure.

Lake Kuttara (倶多楽湖, Kuttara-ko) is a nearly circular caldera lake in Shiraoi, Hokkaidō, Japan.^[1] It is part of Shikotsu-Tōya National Park. The lake is recognized as having the best water quality in all of Japan.^[2] With a transparency of 19 metres (62 ft), the lake ranks second to Lake Mashū according to the Ministry of the Environment.

Resident species of the lake include a salamander species, Ezo salamander (エゾサンショウウオ, Ezo Sanshōuo). Since 1909, Sockeye salmon have been introduced to the lake.