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Lake Ikeda
Lake Ikeda with Mount Kaimon
Lake Ikeda
Location	Kyūshū island
Coordinates	31°14′N 130°34′E / 31.233°N 130.567°E / 31.233; 130.567
Type	caldera lake
Catchment area	41 km (16 sq mi)
Basin countries	Japan
Surface area	11 km (4.2 sq mi)
Average depth	135 m (443 ft)
Max. depth	233 m (764 ft)
Water volume	1.47 km (1,190,000 acre⋅ft)
Residence time	1.7 years
Shore length	15.1 km (9.4 mi)
Surface elevation	63 m (207 ft)
Shore length is not a well-defined measure.

Lake Ikeda (池田湖湖, Ikeda-ko) is a caldera lake located 40 km (25 mi) south of Kagoshima city; Kyūshū island, Japan. It is perhaps best known to tourists as the location of the purported sightings of a monster named Issie, and as the largest lake on Kyūshū island with a surface area of 11 km (4.2 sq mi) and a shoreline length of 15 km (9.3 mi).

Deterioration

The development of the areas surrounding Lake Ikeda has caused the quality of the water to decline since 1955. Other causes include an irrigation project, developed for agricultural field and households in the area, which was initiated in 1965, for it the courses of three nearby rivers were diverted into the lake. The irrigation system has been in operation since 1982, resulting in a considerable improvement of the water quality although since the 1950s the transparency of the lake, though still ranked No. 7 in the world, has decreased from 26.8 m (88 ft) to approximately 5 m (16 ft).

Animals

Lake Ikeda is known to harbour large eels, some six feet in length. In 1998, a benthological survey was conducted in the lake, which found that there were no zoobenthos, although two tubificid oligochaetes and a chironomid were found. The lake was already considered oligotrophic until the 1940s, but one theory for the further drop in underwater life is that the existing life in Lake Ikeda has been affected by Global Warming.

Geology

It is within the Ikeda Caldera and surrounded by its rim and associated volcanic domes.

Mythology

Lake Ikeda is important in the local Shinto folklore of the surrounding regions. Local religious tradition originally held the lake as the origin of humankind.

Issie

Issie (イッシー, Isshī) is a Japanese lake monster said to lurk in Lake Ikeda. It is described as being saurian in appearance. The naming convention is analogous to "Nessie" (the Loch Ness Monster).

According to mythology, Issie was a white mare who lived together with her foal on the shore of Lake Ikeda. However, when the foal was kidnapped by a samurai and Issie was unable to find it, she jumped into the lake and her despair transformed her into a giant, saurian beast, which since then frequently surfaces, trying to find her lost child. The creature was reportedly photographed in 1978 by a man who went by the name "Mr. Matsubara". Twenty other people reportedly also saw the creature swimming in the lake in 1978; they described it as black and having two humps, each about 5 meters (16 feet) long.

See also

• List of lakes in japan
• List of volcanoes in Japan

References

1. ^ "Major Destinations in Japan - Kyushu Island". www.jnto.go.jp. Archived from the original on 2008-01-08. Retrieved 2008-05-21.
2. ^ "International Lake Environment Committee article on Lake Ikeda". International Lake Environment Committee. Archived from the original on 2007-07-15. Retrieved 2008-05-21.
3. ^ "Disappearance of deep profundal zoobenthos in Lake Ikeda, southern Kyushu, Japan, with relation to recent environmental changes in the lake". Ingenta Connect.com. December 2006. Retrieved 2008-05-21.
4. Radford, Benjamin (May 5, 2006). Lake Monster Mysteries: Investigating the World's Most Elusive Creatures. University Press of Kentucky. pp. 145–146. ISBN 9780813171302.
5. ^ Metropolis, "Fortean Japan", 27 June 2008, p. 12.
6. Welfare, Simon; Fairley, John (1980). Arthur C. Clarke's Mysterious World. A & W Publishers. p. 107. ISBN 0-89479-075-7.

External links

• Ikeda and Yamagawa: National catalogue of the active volcanoes in Japan - Japan Meteorological Agency
• Ikeda - Geological Survey of Japan

v t e Lakes in Japan
Hokkaido region	Abashiri Akan Akkeshi Furen Kussharo Kutcharo Kuttara Mashū Notoro Saroma Shikotsu Tōya Utonai
Tōhoku region	Hachirō Hibara Inawashiro Jūsan Ogawara Tazawa Towada
Kantō region	Chūzenji Inba [ja] Kasumigaura Kitaura
Chūbu region	Fuji Five Lakes (Kawaguchi, Motosu, Sai, Shōji, Yamanaka) Hamana Mikata Five Lakes (Mikata, Suigetsu, Suga, Kugushi, Hiruga) Suwa
Kansai region	Biwa
San'in region	Nakaumi Shinji
Kyūshū region	Ikeda
Lakes portal Japan portal

• Lakes of Kagoshima Prefecture
• Volcanic crater lakes
• Ibusuki, Kagoshima