Stock Photo - 28 February 2023, Vietnam, Halong-Bucht: Visitors walk through the Surprise Cave (Hang Sung Sot). Located on Bo Hòn Island, Sung Sot Cave was first discovered by French explorers in 1901. Covering an area of more than 12,200 square meters, the massive cave consists of three smaller compartments or ""rooms,"" each filled with impressive stalactite formations. Halong Bay (Vietnamese: Vinh Ha Long) is an area of about 1,500 square kilometers in the Gulf of Tonkin in Quang Ninh province in northern Vietnam. In 1994, UNESCO declared the bay a World Heritage Site. Photo: Alexandra Schuler/dpa. - Halong-Bucht/Vietnam

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