Lake Kuttara

Lake Kuttara (倶多楽湖, Kuttara-ko) is a near 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.

Relief Map

Lake Kuttara
View from the crater rim (August 2017).
Lake Kuttara
Coordinates	42°30′N 141°10′E [1]
Type	oligotrophic crater lake
Native name	倶多楽湖
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.

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.