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利根川の水を房総半島へ導水する房総導水路の調整池として、東金市にある東金ダムと共に建設され、栗山川(両総用水)から取水され東金ダムから送られてくる利根川の水を、周辺の長生郡市のみならず、松戸市などの江戸川東岸や千葉市などの東京湾岸に上水道と工業用水を供給し、さらに南房総導水路[注釈 1]を系由し南房総に送水することを目的としている。
独立行政法人水資源機構が管理する、高さ52.0メートルのアースダムであり、アースダムとしては高さが日本で第4位、関東地方では最も高く同型式としては日本屈指の規模を有するダムである。ダム、ダムによって形成されたダム湖とも長柄町に所在するが、ダム湖の一部に現在は市原市である旧市津町と接する所があり市津湖と命名された。
なお、同じ名称のダムが香川県綾歌郡綾川町の綾川にも存在する。
The eight islands of Japan sprang into existence through Divine Intervention.The first two gods who came into existence were Izanagi no Mikoto and Izanami no Mikoto, the Exalted Male and Exalted Female. It was their job to make the land for people to live on.They went to the bridge between heaven and earth and, using a jewel-encrusted halberd, Izanagi and Izanami churned up the sea into a frothy foam. As salty drips of water fell from the tip of the halberd the first island was formed. Its name was Onogoro.So far, so good. But when Izanagi and Izanami first met on their island, Izanami spoke to Isanagi without being spoken to first. Since she was the female, and this was improper, their first union created badly-formed offspring who were sent off into the sea in boats.The next time they met, Izanagi was sure to speak first, ensuring the proper rules were followed, and this time they produced eight children, which became the islands of Japan.I'm sure you did not fail to miss the significance of this myth for the establishment of Japanese formal society.At present, Japan is the financial capital of Asia. It has the second largest economy in the world and the largest metropolitan area (Tokyo.)Technically there are three thousand islands making up the Japanese archipelago. Izanagi and Izanami must have been busy little devils with their jewelled halberd...Japan's culture is highly technical and organized. Everything sparkles and swooshes on silent, miniaturized mechanisms.They're a world leader in robotics, and the Japanese have the longest life-expectancy on earth.Text by Steve Smith.