Phong Nha Cave is a stunning limestone cave located in Phong Nha-Kẻ Bàng National Park, Vietnam. It is renowned for its impressive stalactites and stalagmites, formed over millions of years. The cave stretches approximately 44.5 kilometers and features a river that flows through it, creating a unique underground ecosystem. Discovered in 2005, Phong Nha Cave is part of a larger network of caves in the region, many of which are still being explored. The cave is a UNESCO World Heritage Site, attracting tourists and researchers alike who come to admire its natural beauty and geological significance.