A crater lake at the southeastern end of the Satsuma Peninsula in Kagoshima Prefecture. It is located alongside Lake Ikeda and belongs to Ibusuki City. It is a crater lake of the Unagi volcano, with a crater wall that forms a cliff of about 100 meters, and no rivers flowing into it. It has a long axis of 1.3 kilometers, a short axis of 1 kilometers, a circumference of 4.2 kilometers, and an area of 1.2 square kilometers. The water surface is 122 meters above sea level, and the maximum depth is 55.8 meters, making it deep for a crater lake. The annual water temperature of the deep water layer is around 10 degrees Celsius, and the transparency is 8.5 meters. It is classified as a eutrophic lake, and carp, crucian carp, giant eels, and other fish live in the lake. It is said that the name comes from the fact that a 1.5-meter-long eel was once caught in the lake. On a narrow slope at the northeastern end is Unagi Onsen (a sulfurous spring). The water temperature of this hot spring is close to 100°C, and the steam from various places in the village is used for daily cooking, with the stove-shaped facilities here called "sume." Research is also being conducted into geothermal development to use the high-temperature steam as an energy source. The hot spring is part of Kirishima-Kinkowan National Park, and is a 15-minute bus ride from Yamakawa Station on the JR Ibusuki-Makurazaki Line. [Kimihiko Tsukada] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
鹿児島県薩摩(さつま)半島の南東端部にある火口湖。池田湖と並んで位置し、指宿市(いぶすきし)に属する。鰻火山の火口湖で、火口壁は約100メートルの絶壁をなし、流入河川はない。長径1.3キロメートル、短径1キロメートル、周囲4.2キロメートル、面積1.2平方キロメートル。水面標高122メートル、最大水深55.8メートルで、火口湖としては深い。深水層の年間水温は10℃前後で、透明度は8.5メートル。富栄養型湖沼に分類され、湖にはコイ、フナ、オオウナギなどが生息している。昔1.5メートルもある鰻を釣り上げたことから、この名前が由来したという。北東端にある狭小な斜面には鰻温泉(硫黄泉)がある。この温泉は泉温が100℃近くあり、集落内各所の噴気は日常の炊事などに利用され、かまどの形をした設備をここでは巣目(すめ)とよぶ。高温の噴気をエネルギー源にしようと地熱開発の調査もなされている。霧島錦江湾(きりしまきんこうわん)国立公園に属し、JR指宿枕崎(いぶすきまくらざき)線山川駅からバス15分。 [塚田公彦] 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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