Gunung Mulu National Park, located on the island of Borneo in the north-eastern Malaysian state of Sarawak, is the area for a very lush tropical rainforest. Within the Mulu is probably the highest density of caves in the world, with long, tall windows and deep passages.
All the caves were formed by running water, some as many as 5 million years ago. Here is the world’s largest cave, Sarawak Chamber (otherwise Lobang Nasip Bagus). It is 700 m long, 300 m wide and 70 m in height. It could be a garage for 7,500 buses.
Deer Cave, named so because of its input meets a lot of traces of these animals is enormous – 174 mi wide and 120 meters high could accommodate five of London’s cathedral of St. Paul.
Other more well known caves are: Cave of Winds, cave Happinesses.
Within the caves you can meet a variety of animals: blind spiders, crabs, translucent, white serpents. After dark the interior is filled with bats and languages.
The whole system of caves and the area a national park was inscribed on UNESCO’s list of UN organizations.