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This beautiful, circular "caldera" (crater)
lake of approximately 8 km in circumference is situated in the Shikotsu
Toya National Park, and its water is second only to that of Lake Mashu
in terms of clarity. The lake is known as a landlocked-salmon-fishing
Mecca.
According to the results of the
Environment Ministry's public water-quality measurements carried out
in 2001, the lake's water quality was the best in the country, in the
lakes and marshes category.
- [Origin of the name]
The prevailing view is that the name originates from
the word Kuttarushi-to, meaning a lake in Kojohama.
- [Birth]
The prevailing theory is that the crater-lake was formed
when the summit of the Kuttara volcano caved-in approximately 40,000
years ago.
- [Surface area of the lake]
4.7 km2 - the 19th largest in the country.
- [Lake's capacity]
0.491 km3 - the 7th largest in the country
- [Altitude of lake]
The eighth highest in the country
- [Depth]
Maximum 147 m; average 104.5 m - the fourth deepest in
the country
- [Water quality]
The best in the country(COD=0.7mg)
- [Clarity]
28.3 m The second clearest in
the country
- [Degree of orbicularity]
1.5 The most orbicular in
the country
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Landlocked-salmon fishing
Landlocked-salmon fishing in Lake Kuttara is limited to a certain season.
The season usually runs from mid May to early August, when fishing is
only permitted from rented boats (up to 2 persons per boat). Each person
is allowed up to 3 rods. Ground baiting is prohibited, and those fishing
are obliged to report the number of fish caught.
Fishing fee: ¥1,500 per person
Rental boat: ¥2,000 per boat
Landlocked-salmon fishing season (2004): (May 15 - June 13) 7:00 - 17:00,
 (June 14 - July 31)
9:00 - 16:00
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