While all four of the Show Caves in the Park were formed by the action of water dissolving the limestone and by the action of powerful rivers flowing through them, each has their own particular attraction.

Visiting Deer and Langs Caves

Getting there        Rainforest Discovery Walkway
Distance/time    3km, allow 1 hour each way & time in the caves

An easy walk along the Rainfall Discovery Walk through the lush forest and alongside rushing rivers to the entrance of the World’s largest cave passage.

Pause in Deer Cave’s ancient riverbed and wonder at the force of the water that once roared through, tumbling huge boulders around and carving the scalloped walls. Above your head columns of water stream from the roof to join the river passages that twist and turn through the mountain, continuously enlarging and changing the shape of the cave.

Listen! - - - - That squeaking noise you’ll hear in the cave is the 3 million strong colony of Wrinkle Lipped bats stirring themselves as they sense that dusk is not far away and they begin to prepare to leave the cave to feed on flying insects. The birds you see swooping through the darkness are the swiftlets returning to roost in the cave. The path continues to wind deeper into the blackness of the cave and suddenly the Garden of Eden appears in the distance, a green oasis shining in the sunlight. Nearby are Adam and Eve’s Showers spouting 30 metre columns of water to the river far below.

The Bat Exodus

Twelve species of bats have been recorded within Deer Cave, including the colony of Wrinkled-Lipped Bats estimated to number between 2.5 and 3.5 million individuals.

While you wait in the Bat Observatory for the nightly flight of bats to begin you can watch the secret life of millions of bats on MULU BAT CAM a remote controlled, closed circuit TV system which takes you into the dark recesses of the cave to observe the bats ‘live,’ up close and sometimes a bit personal!.

Expectation builds as the sun moves towards the horizon and the Bat Hawks take up their roost on the cliff face, waiting for the first of the millions of bats appear. Each evening the bats gather at the cave entrance in large ring-shaped formations, circling higher and higher up the cliff face before moving out across the rainforest in spiraling ribbons.

It has been estimated that nightly each bat consumes between five and ten grams of flying insects. This means that 3 million bats will return in the morning to deposit a huge amount of guano in the cave and provide a unique ecosystem, home to millions of insects and their predators.

The bats leave the cave on most evenings between 5.30 pm and 6.30 pm but on rare occasions do not leave at all. Even more rarely they sometimes leave as early as 4.30pm!

The return trip to Park HQ is a wonderful time to move through the forest, listening to the calls of the frogs and insects, often seeing fireflies and stick insects.

After visiting the cave of the Winds - a really cool place - your Guide will take you on a short walk further along the river to the nearby Clearwater Cave where the river roaring beneath your feet has travelled its subterranean route for over 170km. Giant logs thrown high on the banks and wedged under boulders are evidence of the power of this mighty underground river. Swimming is not permitted in the cave however once you are back outside of the cave you can enjoy a swim in the crystal-clear waters where the river emerges from the cliff face. Float with the fish and enjoy the rainforest around you. Take a picnic lunch and relax at the Clearwater picnic site.

The Fast Lane’

A short boat ride, a 500 metre walk through the rainforest and a climb up the steps to the cave entrance brings you to the beginning of your 1.5km underground adventure. This tour is unlike any other offered in Mulu. The group is limited to 12 persons and as the only ones in the cave you can fully enjoy the story of the cave’s origins.

The tour begins by torchlight encouraging you to ‘discover’ for yourself. Cave fauna is easily seen at the beginning of this trip; twinkling spider eyes stare back at you, beautiful blue Racer snakes sit waiting to catch a bat flying by, white crabs feed blindly in the shallow pools of water and the long antennae of cave crickets pickup your movements as you pass by.

As the cave becomes larger some of the best formations in Mulu are presented to you via stunning lighting. The wide plank walk path allows you to look around you and thoroughly enjoy this amazing experience.

Turtle Cave adventure (an extension of Clearwater Cave) at 12.00 noon - RM20 per person

Why not try leaving the Clearwater Cave by river instead of the pathway. Your Park Guide will lead you down into the river away from the lights to a very different world. Be careful as you walk, the rocks are sharp and sometimes you will need to swim with the river current for short distances on its path out of the mountain.

Purchase your tickets at the Park Office before leaving. You will need to take a torch and shoes suitable to protect your feet.

The Guide is not permitted to take you adventure caving if you are wearing sandals.

Racer Cave (Introduction Level) (minimum of 3 persons – maximum of 8 persons)

Lagangs Cave (Introduction Level) (minimum of 3 persons – maximum of 8 persons)

Clearwater/Wind Cave Connection (minimum of 3 persons)

Sarawak Chamber (Advanced) (minimum of 3 persons)

(Advanced Level – requires Park Manager approval)
Sarawak Chamber is a tour for visitors that

Sarawak Chamber is a challenging trek even for fit and experienced cavers. Taking one very full day, beginning at 6.30 am at the Park HQ Office you will follow the Summit Trail for about 3 hours to reach the entrance to Good Luck Cave. Access to the chamber takes about 3 hours along a 800 metre river channel with sheer rock faces rising to about 50 metres on either side.

After a 200 metre traverse and a steep boulder slope you come face to face with the inky blackness of Earth’s largest chamber, but you wont actually get into the chamber itself.
Enjoy a short rest at the mouth of the chamber, before the return trip.

You will need to have good hiking boots, a day pack, raincoat, lunch, water, personal first aid kit and a back up torch. You will be provided with a caving helmet, head lamp and ropes as required.