Khanh Hoa, Oct. 11 -- Nestled in Vinh Hai commune in the coastal province of Khanh Hoa, Hang Rai is one of the most captivating attractions within the Nui Chua National Park, which forms part of the Nui Chua World Biosphere Reserve.

Often described as a "coral paradise on land", this coastal wonder boasts an ancient fossilised coral reef with striking rock formations that draw travellers eager to explore and marvel at its surreal beauty.

Hang Rai is defined by rugged mountain ranges and clusters of oddly shaped rocks stacked upon one another, set against the park's distinctive dry coastal forest ecosystem. Constant waves crash against the cliffs, carving out large cavities that once served as a habitat for otters - the very origin of th...