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A three-kilometer plank trek through peat bog, alluvial plains, and limestone outcrops leads to Deer Cave. Fantastic rainforest, rushing jungle streams, and an old Penan burial cave may all be seen on the walk to the cave. 

There is no mistaking the fact that you are standing at the entrance of the world's longest cave corridor. Deer Cave is enormous, stretching for more than 2 kilometres with a width that is never less than 90 metres. With a width of 174 metres and a height of 122 metres, the main room is partially illuminated by natural light. The name is inspired by the native Penan and Berawan people who called this place Gua Payau or Gua Rusa—both local terms for "deer"—as it was once a former haven for the region's deer population. 

The cave's entrance is marked by a walkway that curves within, following the cave's organic topography. Although there is illumination along the way, a flashlight is helpful for exploring the guano-covered cave floor and its bug population. The route culminates in the "Garden of Eden," where a beam of light streams in through a breach in the cave ceiling. The unmistakable likeness of Abraham Lincoln stands watch above the cave's southern entrance. 

As could be expected, Deer Cave serves as a refuge for many different kinds of bats. Depending on the weather, between 5 and 7 o'clock in the evening, visitors may be treated to the incredible sight of a black cloud of free-tailed bats coming from the cave mouth in quest of food. Researchers had estimated that hundreds of thousands of bats resided in this cloud, but new research puts that number at over a million. 

Most people who go to Deer Cave also go to Lang's Cave, the entrance to which is just a few yards away. The granite patterns of Lang's Cave make it the most compact of the exhibition caves. Stalactites and stalagmites are made more alluring by carefully placed lighting. The cave is tiny and well-lit, so it's possible to observe some animals that live there, like bats, swiftlets, and even snakes that normally live in dark places. 

The length of the Clearwater Cave system, the longest in Asia, is an astounding 215 kilometres (of explored area). A portion of its underground river is even boatable. You can get to Clearwater in two different ways: either take the 4-kilometre nature route that can be completed in about 1.5 hours or take a long boat down the Melinau River, where you can also visit Wind Cave. Normal boat travel time to Wind Cave is roughly 15 minutes. If the water is low, the boatman will have to get out and push, adding extra time to the trip. 

Wind Cave, so called for the chilly winds that may be felt at the narrow areas of the cave, is reached by a plank walk from the riverbed. The "King's" Room in Wind Cave, a component of the Clearwater system, is showered in natural light and has many spectacular stalactites, stalagmites, flow rocks, helictites, and rock corals. 

A picnic deck close to the entrance of Clearwater Cave may be reached from Wind Cave by a plank walk or a boat ride. The trip, in any direction, won't take more than 5 minutes. The entrance to Clearwater Cave is located in the forest at the top of 200 steps. Clearwater is an exciting cave to explore because of the subterranean river it contains. This is made simple and pleasurable by the presence of plank walks, walkways, and little floating bridges. Cave photographers willing to wait for the perfect shot will be rewarded. 

Follow the cave tour with a descent to the picnic deck. Clear subterranean water flows from the cave into a pool by the deck. Many tourists come to this area to cool down in the crystal-clear waters. Those who would rather take it easy may lounge around the picnic tables and take in the sights of the tropical rainforest or observe the fluttering of the many species of butterflies that can be seen along the riverbank. You might even see a Rajah Brooke butterfly if you're fortunate, named for its enormous size and vivid green wings.