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Cam Son Lake is located in Luc Ngan district (Bac Giang province) bordering Lang Son, Vietnam
Normally, the lake surface is 2,600 ha but in the rainy season, floods are high, the water rises, the lake surface can now be up to 3,000 ha. The length of the lake is nearly 30 km (18.8 mi), the widest width. 7 km (4.38 mi), the narrowest 200 m (600 ft)