The bay stretches from Yên Hưng district, past Hạ Long city, Cẩm Phả town to Vân Đồn District, bordered on the south and southeast by the Gulf of Tonkin, on the north by China, and on the west and southwest by Cát Bà Island.
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There are remains from mounds of mountain shellfish (Cyclophorus), spring shellfish (Melania), some fresh water mollusc and some rudimentary labour tools.
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The Bãi Cháy Bridge is a cable-stayed bridge on Highway 18, connecting Hồng Gai with Bãi Cháy over the Cửa Lục Straits, separating Cửa Lục Bay with Hạ Long Bay, the territory of Quảng Ninh Province, Vietnam.