Ha Long Bay is located in the northeast of Vietnam. It is a karst bay in Quang Ninh Province. It has a total area of ​​1,553 square kilometers and nearly 2,000 limestone islands. Due to its unique karst landscape, it is known as the "Guilin on the Sea". It has diverse biodiversity and many attractions, such as the Incense Burner Stone and the Surprise Cave. It was listed as a World Heritage Site in 1994.