Gunung Mulu is a national park located in Malaysian Borneo, known for its stunning limestone karst formations and rich biodiversity. The park covers over 52,000 hectares and is home to one of the world's largest cave systems, including the famous Sarawak Chamber, which is one of the largest cave chambers on Earth. The park is also recognized as a UNESCO World Heritage Site due to its unique ecosystems and geological features. Visitors can explore various trails, caves, and rivers, making it a popular destination for ecotourism and adventure activities, such as caving and trekking.