Mulu Caves National Park is 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.

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.

Over 400km up the coast from Kuching, hidden in the forests of Miri, are the Niah Caves. The park covers a vast swathe of 3,140 hectares of peat swamp, dipterocarp forests, as well as the massive limestone outcroppings within which the giant Niah caves are concealed. The caves consist of one big cave (The Great Cave) and some smaller caves.

In 1958, archeologists discovered evidence of human occupation of the caves dating back some 40,000 years. Rock paintings were found in what has become known as the Painted Cave, and the discovery of several small canoe-like coffins (death ships) indicate that this site was once used as a burial ground.