Things to Do in Mulu
Of all the wild places I have traveled in Borneo, Gunung Mulu National Park stands alone. This UNESCO World Heritage site in northern Sarawak hides some of the largest cave chambers on Earth under a sweep of jungle and limestone. I have spent days and nights here, and these are the experiences I would not let you miss.
The Caves of Mulu
Mulu is above all a cave kingdom, and the tours set the tone. Start with Deer Cave, the vast passage that once funneled massive herds of deer into its mouth. Walking through its echoing darkness, I felt smaller than I ever have indoors, its sheer scale straining the flashlight beam and the walls vanishing beyond the reach of the glow. Next door, Lang Cave feels intimate by contrast, its rimstone pools and stalactites dripping with detail.
For something wet, the Wind Cave and Clearwater Cave combo rewards you with underground rivers and ladder climbs, and Cool Water Cave lets you wade through crystalline pools that drop the day’s heat from your skin. Book your tours at the park offices on arrival, because slots fill fast in the high season and the guides who run them bring the caves to life with geology and local legend.
Watching the Bat Exodus
Twice a day, hundreds of thousands of wrinkle-lipped bats pour out of Deer Cave in a living ribbon against the twilight sky. I have watched this exodus many evenings, perched on the viewing platform with a growing crowd, and it never gets old. The bats stream, swirl, and tangle into shapes against the darkening jungle while the sun sinks behind the limestone, and the sounds of a million wings wash over the silent audience.
Time this with the guided evening tour so you can hear the naturalist explain the colony’s rhythm, from how the bats hunt to why they funnel out in swarms, then stand back and simply let the scale of it wash over you. It is the moment every Mulu itinerary builds toward, and it earns every bit of the hype.
The Canopy Skywalk
For a completely different view, take the Mulu Canopy Skywalk, a suspended walkway that threads through the treetops of the rainforest above the park HQ. Strung between tall trees, it sways gently as you cross, and I found myself eye level with birds and monkeys that never notice the people below. The morning light filtering through the canopy makes this my favorite hour of the day in Mulu, when the mist burns off and the jungle wakes around you.
The walk takes well under an hour and needs no special fitness, so it suits everyone from families to serious hikers looking for a gentler counterpoint to the big treks.
Climb Pinnacles and Waterfalls
If your legs are up for it, the Pinnacles trek is the park’s most famous challenge. After a boat ride and a stream crossing, you face a brutal near vertical climb up a limestone ridge to the famous razor sharp limestone spires that spear the sky. The trail is punishing, with ropes and ladders for the final stretch, and I was grateful for my headlamp on the dark start and my gloves for the rope sections. Standing among those serrated peaks above the jungle is the single most dramatic view I have climbed for in Malaysia.
Closer in and far easier, the Paku Waterfall offers a cooling swim on a hot afternoon, reached by a flat walk from base. I have spent lazy hours there, floating in the green pool while the jungle buzzed around me, and it is the perfect way to recover after the effort of the caves and the ridge.
Pulau Pitan and Boat Trips
The Melinau River threads through the park, and taking a boat trip on it is its own reward. I have ridden the longboats upriver to the Penan longhouse at Pulau Pitan, where the community welcomes visitors with handmade crafts and stories of forest life. The ride itself, slicing through jungle corridors and past limestone cliffs rising sheer from the banks, is reason enough to go, and the current pulls hard enough that every bend feels like a new secret.
Practical Tips
Mulu is reached by a short flight from Miri, and your arrival is an event in itself as the plane dips between close green hills to land beside the jungle. Pack sturdy shoes, long sleeves, and trousers for the caves and leeches, plus a headlamp and gloves if you plan the Pinnacles, and buy a park pass on your first day. Book accommodation inside the park early in the dry high season and give yourself at least three days to do Mulu justice.
My Verdict
Mulu is one of the great natural wonders of Southeast Asia, and it rewards every minute you give it. Sink into the caves, stand under the bat exodus, sway across the canopy, and if you have the legs, climb to the Pinnacles. A few days here recast how you think about the wild, and I have never left without something deep in me changed.
