Lake Hjälmaren (English spelling)

Japanese: イェルマル[湖]（英語表記）Hjälmaren

Located in southern Sweden, this is the country's fourth largest lake (area 480 km2), 61 km from east to west, 21 km wide, and 20 m deep at its deepest. Two rivers flow into it from the west, and to the east it is connected to Lake Mälaren by rivers and canals (Stockholm is at the eastern end of this lake). This area was the site of a strait connecting the Baltic Sea and the North Sea 6,000 to 7,000 years ago, and the sedimentary rocks on top of the solid bedrock were selectively eroded by ice to form the lake basin. Farming has been practiced around the lake since ancient times, and it was a key route for east-west transportation, and in the 1870s it underwent major renovations to prevent flooding.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

スウェーデン南部，同国第4の湖(面積480km2)で，東西61km，幅21km，最深20mである。西から二つの川が流れこみ，東は川と運河でメーラル湖(この湖の東端にストックホルムがある)につらなる。このあたりは，6000～7000年前にバルト海と北海を結ぶ海峡があった所で，固い基盤岩の上にのる堆積岩が，氷に選択的に削られて湖盆をつくった。湖の周辺では古くから農耕が行われ，東西交通の要路に当たり，1870年代には洪水を防ぐ大改修が行われた。

出典　株式会社平凡社世界大百科事典第２版について　情報

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