Lake Tazawa

Japanese: 田沢湖 - たざわこ

A lake in the Ou Mountains in eastern Akita Prefecture. It is located almost in the center of Senboku City. It is a caldera lake formed by the collapse of a volcano in the Nasu volcanic belt. It has an area of 25.8 ^km2 , a circumference of 20 km, and an elevation of 249 m above sea level. Its maximum depth of 423 m makes it the deepest in Japan. Its water transparency was one of the best in Japan at 33 m in the 1930s, but it has declined significantly due to pollution. It is a typical acidotrophic lake, with few fish and a nearly circular shape typical of a caldera. It is said that the large amount of water it holds, despite having almost no inflowing rivers, is due to the large amount of spring water at the bottom of the lake. The outlet, the Katajiri River, in the west, was closed in 1940 to operate the Honai Power Station. At that time, highly acidic water from the Tama River was flowed into Lake Tazawa for power generation, causing the death of endemic fish species such as the Kunimasu. The surrounding area is a major power source for Akita Prefecture. The lakeside is home to scenic spots such as Shirahama, Gozanoishi, and Tagonoki, and together with the Dakigaeri Valley in the southeast of Senboku City, it belongs to the Lake Tazawa Dakigaeri Prefectural Natural Park.

Lake Tazawa

The former town area occupies almost the eastern half of Semboku City in eastern Akita Prefecture. It is located on the east side of Lake Tazawa and borders Iwate Prefecture to the east. In 1956, Honai Town, Jindai Village, and Tazawa Village were merged to form Tazawako Town. In 2005, it was merged with Kakunodate Town and Nishiki Village to form Semboku City. The central settlement, Ihonai, had a guard post in the Edo period and prospered as a key transportation point connecting the Akita Domain and the Morioka Domain. It is an important power source area in the prefecture, blessed with forest resources, and has many woodworking factories such as large beech lumber mills. It belongs to Towada-Hachimantai National Park and Tazawako Dakigaeri Prefectural Natural Park, and has many tourist attractions such as Lake Tazawa, Lake Hosen created by Tamagawa Dam, Mt. Komagatake (1,637m), Tazawako Plateau, Nyuto Onsenkyo, and Tamagawa Onsen. The Beitou stone at Tamagawa Onsen has been designated a Special Natural Monument by the nation, and the alpine plant zone of Mt. Komagatake has been designated a national natural monument.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

秋田県東部，奥羽山脈にある湖。仙北市のほぼ中央に位置する。那須火山帯系の火山の陥没によって生じたカルデラ湖。面積 25.8km²。周囲 20km，水面標高 249m。最大水深 423mで深さは日本第1位。透明度は 1930年代には 33mで日本有数を誇ったが，汚染により著しく低下した。典型的な酸栄養湖で，魚類は少なく，カルデラ特有のほぼ円形状を示す。流入河川がほとんどないにもかかわらず，多量の水をたたえているのは，湖底の湧水が多いためといわれる。西方にある排水口，潟尻川は 1940年生保内発電所の操業のため閉め切られた。このとき発電用に強酸性の玉川の水を田沢湖に流入させたため，固有種のクニマスなどの魚類が死滅した。周辺一帯は秋田県の主要な電源地帯。湖畔には白浜，御座ノ石，田子ノ木などの景勝地があり，仙北市南東部の抱返り渓谷とともに田沢湖抱返り県立自然公園に属する。

田沢湖
たざわこ

秋田県東部，仙北市のほぼ東半分を占める旧町域。田沢湖の東側に位置し，東は岩手県に接する。 1956年生保内町と神代村，田沢村の2村が合体して田沢湖町が発足。 2005年角館町，西木村と合体して仙北市となった。中心集落の生保内は江戸時代に番所が置かれ，秋田藩と盛岡藩を結ぶ交通の要地として繁栄した。県内における重要な電源地帯で，森林資源にも恵まれ，大規模なブナ製材所など木工場も多い。十和田八幡平国立公園，田沢湖抱返り県立自然公園に属し，田沢湖をはじめ玉川ダムによりできた宝仙湖，駒ヶ岳 (1637m) ，田沢湖高原，乳頭温泉郷，玉川温泉など観光地が多い。玉川温泉の北投石は国の特別天然記念物，駒ヶ岳の高山植物帯は国の天然記念物にそれぞれ指定されている。

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