Phong Nha-Ke Bang is a UNESCO World Heritage Site located in Vietnam. It is renowned for its stunning limestone karst landscapes and extensive cave systems, including the famous Phong Nha Cave and Son Doong Cave, which is the largest cave in the world. The area is rich in biodiversity, hosting numerous species of flora and fauna. The park covers approximately 885 square kilometers and is part of the Annamite Range. It features a unique ecosystem with tropical forests and various geological formations. Phong Nha-Ke Bang is a popular destination for eco-tourism, attracting visitors interested in adventure activities like caving and hiking.