Gunung Mulu National Park is Malaysia's Second UNESCO World Natural Heritage Site. This natural heritage site was inscribed by UNESCO on 27-Nov-2000. It covers an area of about 528 km² which includes some of the world most outstanding caves system.

The caves system in Gunung Mulu National Park inludes :
1. Cave of the Winds where you can find very huge columns and stalagmites in the King's Chamber.
2. Clearwater Cave which has a 108km underground river which can flow giant logs. Outside this cave you can swim in its crystal clear water.
3. Deer Cave which was an ancient riverbed, previously the world's largest cave passage. There are millions of bats living in this cave. You can take the riverbed route to a glowing pool of light.
4. Langs Cave which has spectacular stalactites, stalagmites and layers of rimstone pools.
5. Sarawak Chamber which is the largest cave chamber in the world. Sarawak Chamber is not opened to public and must get permission to enter.

Gunung Mulu National Park has a karst topology and is largely made up of limestone, a sedimentary rock which is partially soluble. It has an area with jagged limestone pinnacles scattered over an area surrounded by plants.

Gunung Mulu National Park has an area with poor nutrient soil. This area is the Kerangas or Heath Forest which is good habitat for pitcher plants. This area also has river pools and a magnificient gorge called Melinau Gorge.

Apart from its natural built-up and wildlife, Gunung Mulu National Park has a 480m long skywalk called Mulu Canopy Skywalk. This skywalk is one of the longest tree-based canopy walk which is about 20 m above ground. Also you can visit some villages of the native indigenous people in Gunung Mulu National Park such as Penan.

Like all jungle and national parks, Gunung Mulu National Park has many types of plants and flowers and many wildlife including birds and insects. Common animals here are giant porcupine, wild boar, great argus pheasant and of course, bat. Tourist can ask for the tour to watch bats flying out from cave in the evening to search for food.

Travel Tips and How to get to Gunung Mulu National Park?
1. Take a flight with MAS from either Miri or Kota Kinabalu or Kuching to Mulu.
2. Take a 10-hour river trip from Miri to Mulu : Go to Kuala Baram for a river trip up to Marudi and change boat to Long Terawan. From Long Terawan, take a longboat to the park.
3. There is a park entry fee. Office Hours from 08:00 to 17:00 daily.
4. Accommodation with and without air conditioning can be found in the park's hostels beside Melinau River.
5. Tours can be arranged with Gunung Mulu National Park guides. Examples of advanture tours are Bat Watching, caving, jungle trail to the Pinnacles, Kerangas / Heath Forest, Head-hunters trail, Mulu Canopy Skywalk, visit native villages, explore Deer Cave's underground river to glowing pool and hike to the Summit. There are tours to get to know local plants in Gunung Mulu National Park.