The country that contains the natural wonder of Halong Bay is Vietnam. This UNESCO World Heritage Site is renowned for its emerald waters, thousands of limestone islands, and unique rock formations. Halong Bay's stunning scenery, characterized by its karst landscapes, attracts tourists from around the world who come for sailing, kayaking, and exploring caves. The bay is an important site for biodiversity, housing various marine species and ecosystems. Additionally, Halong Bay holds cultural significance for the local communities that rely on its resources and tourism, making it a cherished natural treasure of Vietnam.