The Pinnacles Trek in Mulu Caves
Part of the Mulu Caves travel guide — see every topic in All Mulu Caves Guides.
The Pinnacles are a field of razor-sharp limestone blades, some forty-five metres tall, standing on the flank of Gunung Api in the middle of Mulu's karst. They were formed by rainwater dissolving vertical fractures in the limestone over millions of years, leaving the harder rock between as free-standing spires. Reaching the viewpoint takes three days: a longboat and a jungle walk to Camp 5, then a brutal 1,200-metre climb up the mountainside, and back the same way.
The route
Day one: a longboat up the Melinau river and then an eight-to-nine-kilometre walk through rainforest to Camp 5, a basic shelter beside the river with bunk platforms, a kitchen area and cold water — three to four hours in total. Day two: the climb, 2.4 kilometres of distance and around 1,200 metres of ascent to the viewpoint, then back down to Camp 5. Day three: the walk and the boat back to headquarters. The distances are short and the day-two climb is what people underestimate.
The climb
Relentlessly steep from the start, on limestone that is jagged, wet and sharp, with tree roots, ladders and fixed ropes on the upper sections and several aluminium ladders bolted to the rock near the top. It takes three to five hours up and often longer down, since descending on sharp wet limestone is slower and harder on the knees than climbing it. There are checkpoints with cut-off times: if you have not reached a given marker by a set hour, the guide turns you back, and a meaningful proportion of parties are.
Requirements
Booked in advance through the park, with a minimum group size and a compulsory guide. There is a fitness declaration and it is taken seriously. Camp 5 is basic: bring a sleeping bag liner, your own food or the park's arranged provisions, a torch and everything else, since there is no shop. Gloves are genuinely recommended for the fixed ropes and the limestone, which will cut hands. Sturdy boots with good grip, not trainers. And two to three litres of water per person for the climb.
Is it worth it
The viewpoint looks across at the pinnacle field from a platform on the mountainside — grey blades rising out of green forest, frequently in and out of cloud. It is genuinely remarkable and it is a hard-won view rather than a spectacular one at first glance. People who enjoy the trek tend to be people who wanted the trek. If you want the landscape without the climb, the Mulu Canopy Skywalk and the show caves deliver a great deal for a fraction of the effort, and the Headhunters' Trail from Camp 5 is a different and gentler adventure.
The Pinnacles Trek at a glance
| What | Limestone blades up to 45 m on Gunung Api's flank |
|---|---|
| The trek | 3 days — boat and walk in, climb, walk and boat out |
| The climb | 2.4 km distance, ~1,200 m ascent, 3–5 h up |
| Terrain | Sharp wet limestone, roots, fixed ropes and ladders |
| Cut-offs | Timed checkpoints — guides turn parties back |
| Bring | Gloves, boots, 2–3 litres of water, sleeping bag liner |