Cam Son Lake is a lake in Luc Ngan District, Bac Giang Province

Bắc Giang Province

Bắc Giang is a province of Vietnam. It is located in the northeastern part of the country, being situated to the east of Hanoi. The province covers an area of 3827.45 square kilometres and as of 2008 it had a population of 1,628,400 people....

, Vietnam

Vietnam

Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...

, near the border with Lang Son Province

Lạng Sơn Province

Lạng Sơn is a province in far northern Vietnam, bordering Guangxi province in China. Its capital is also called Lang Son, which is a strategically important town at the border with China and is northeast of Hanoi connected by rail and road...

. The lake lies off Highway 279, northeast of the city of Bac Giang

Bac Giang

Bắc Giang is a city in Vietnam. It is the capital of the Bac Giang province. Its name, deriving from Sino-Vietnamese, means "north of the river." Bac Giang was formerly a sister city with Madison, Wisconsin, United States....

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The lake has an area of some 2600 hecatres, but during the rainy season when flooding is common, the lake can expand to some 3,000 hectares . The length of the lake is about 30 km ( 18.8 miles ). Its widest point is about 7 kilometers ( 4.38 miles ) and narrowest point is about200 m (600 ft. ).