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From Wikipedia: http://en.wikipedia.org/wiki/Hoan_Kiem_Lake
Hoan Kiem Lake (Vietnamese: Hồ Hoàn Kiếm, meaning "Lake of the Returned Sword" or "Lake of the Restored Sword", also known as Hồ Gươm - Sword Lake) is a lake in the historical center of Hanoi, the capital city of Vietnam. The lake is one of the major scenic spots in the city and serves as a focal point for its public life.
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Hoan Kiem district is one of the old district of Hanoi. This district covers the old quarters.