Mulu Caves National Park is home to one of the longest networks of caves in the world. Here lies the world’s largest underground chamber, the Sarawak Chamber, capable of accommodating forty Boeing 747 airplanes.Located in Northern Sarawak near the town of Miri and is part of the Mulu National Park which is also a designated UNESCO World Heritage Site.

It is also Sarawak's largest national park, covering 52,865 hectares of primary rainforest, which is criss-crossed by fast flowing rivers and clear jungle streams. Mulu is dominated by three mountains - Gunung Mulu (2,376 m), Gunung Api (1,750 m) and Gunung Benarat (1,585 m).

Yet many of Mulu's greatest attractions lie deep below the surface. Hidden underneath the forested slopes of these mountains is one of the largest limestone cave systems in the world.

Mulu's four Show Caves were selected for their uniqueness or sheer beauty. Besides the popularly visited Deer Caves, Lang Caves, Clearwater Caves and Lady's Caves, a more strenuous trek leads to a weird landscape of razor-sharp rock pinnacles.

In Mulu, you will also find the world’s biggest cave passage, Deer Cave, which can fit five cathedrals the size of Saint Paul’s in London. Another key attraction is Clear Water Cave, the longest cave in Southeast Asia. The massive caves here are home to millions of bats and cave swiftlets that swarm out into the jungle in great clouds every evening at dusk!

The outdoorsy type will be pleasantly surprised by some of the best examples of tropical limestone weathering in the world, including enormous razor-sharp pinnacles, deep-cut canyons, appropriately named The Pinnacles. There are tough but rewarding multi-day hikes available from the resort. A guide and porter are recommended.

And then there is Mount Mulu itself, with its 1,500 species of flowering plants including 170 species of orchids, 67 species of mammals, 262 species of birds, and 281 species of butterflies. From the summit, you will be treated with the breathtaking view of the park's surrounding. The journey normally takes about four days through the moderate jungle terrain.

The Canopy Skywalk, the world's longest tree-based structure, in Mulu National Park allow visitors a glimpse of life in the treetops of the rainforest. 480 meters of walkway hang 20 meters above the forest floor, forming a circular route suspended between 15 trees with a separate exit tower.