Deer Cave is a large limestone cave located in Gunung Mulu National Park, Malaysia. It is known for its impressive size, measuring about 2 kilometers long and 174 meters high. The cave features stunning rock formations and is home to a significant population of bats, which contribute to its unique ecosystem. The cave is famous for its natural beauty and biodiversity, attracting tourists and researchers alike. Visitors can observe the spectacular sight of bats emerging at dusk, creating a mesmerizing display in the sky. Deer Cave is also part of a larger network of caves in the park, making it a key site for geological and ecological studies.