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Caves Activities

  OVERVIEW ..............................................................................................................................................................

Mulu possesses some of the largest and most spectacular caves in the World.

but please be aware that visitors are not permitted to enter any of the caves within the Park without a Licensed Park Guide.

Daily tours with Mulu World Heritage Guides are available to all the four show caves in the Park or you can make a reservation to explore some of the ‘wild caves’ on a guided Adventure Tour.
(‘Show caves’ have timber/concrete pathways and artificial lighting - ‘wild caves’ do not.)

Enquire at the Park Headquarters office to register and to pay your Park Entry and Guiding Fee. Unless you are a large group, reservations for the show caves are not essential.

Show cave tours are also offered by local Tour Operators using Licensed Park Guides.


  SHOW CAVES ........................................................................................................................................................

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

Scheduled twice daily tour with
World Heritage Guide

2.00pm and 2.30pm from the Park Office. Be at the Park Office at least 10 minutes before the listed tour time.

RM25 Per Person




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.


Langs Cave

Deer Cave is awesome, large and bold but only 100 metres away is Langs Cave.Small and intimate, with walls beautifully decorated with long shawls, layers of rim stone pools on the floor, and throughout the cave, spectacular stalagmites and stalactites. 

In this smaller cave the bats are easier to see, small white cave prawns hide in pools of water and shimmering near the roof are strands of web spun by the thread worm larvae waiting for a passing meal.

After visiting the caves, you can wait at the Bat Observatory to view the evening exodus of bats from the Deer Cave.    Drinks and snacks are on sale each afternoon.




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.




Visit Clearwater Cave and Cave of the Winds in the mornings

Getting there               Take a longboat from Park HQ
Distance//Time          3.8 km /3-4 hours (including the boat ride)

Scheduled twice daily tour with World
Heritage Guide

8.45am and 9.15am from the Park Office. Be at the Park Office at least 10 minutes before the listed tour time

RM25 per person

Longboat from Park HQ to Caves and return

RM30 per person




Cruise up the Melinau River in a longboat and visit the Penan longhouse market on your way to Cave of the Winds and Clearwater Cave.  (The market is not open on Sundays.)


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.




ADVENTURE CAVING......................................................................................................................................



Do you want to see more of Mulu’s vast cave system? Then try adventure caving and no matter what your experience, there is an adventure just right for you.

Caves are rated as Introduction, Intermediate and Advanced. 

(Advanced adventure caving is strictly for visitors who:-

  • Can demonstrate current membership of an internationally recognized speleological society or caving group, or
  • Can provide details of* previous caving experience or

Minimum previous experience for this cave is described as an expedition of at least 3 hours duration in a wild cave which has no lighting or pathways.
* Verifiable written evidence on each participant’s previous caving experience must be provided to the Park Manager for his approval..

Visitors who do not have previous experience must participate in a tour of an Introduction or Intermediate level cave to show the Guide their abilities and an advanced adventure caving trip may be organized for the next day.

You need to be reasonably fit with the ability to be underground in small dark places. Caving at Mulu often involves wading across rivers or streams, squeezing between rocks and through crevices, swimming up underground rivers, and of course, getting covered in dirt. You need to wear non slip shoes that can get wet, SANDALS ARE NOT ALLOWED.

The Park provides competent guides, caving helmets and headlamps. Visitors need to bring their sense of adventure, wear good walking shoes and take some drinking water.On the longer tours you should take some snacks to eat after you have finished caving.

How long each tour takes depends very much on the fitness of, and the number of people in the group. The bigger the group the longer it takes to get the whole team through the more difficult bits.

For the following tours marked ‘Advance Booking Required’ you must pay a 25% deposit to ensure that a guide will be available for you at the time you want. Deposits for advance bookings cancelled 48 hours or more before the scheduled tour time will be fully refunded.

The Park reserves the right – and indeed the responsibility – to cancel any tour if in the opinion of the Park Guide :

  • The water level in the cave is too high
  • The weather is showing clear signs that heavy rain can be expected during the tour
  • There are people in the group who simply will not fit into parts of the cave which cannot be avoided
  • There are people in the group who have demonstrated that they are unwilling or unable to follow the instructions of the guide.

If the tour is cancelled by the Park Guide before it commences a full refund of any money paid for the tour will be given.
If for any reason a tour is justifiably terminated by the Park Guide, or by the participants, after commencement there will be no refund of any money paid.





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.

Scheduled daily tour with World Heritage Guide
1.30pm at the Park Office

RM60 per person includes the longboat return from Park HQ




Garden of Eden Valley Walk (minimum of 3 persons – maximum of 8 persons)

Advance Booking Required
RM130 per person
Picnic Lunch and afternoon tea is included
No additional charge for Deer and Langs Cave tours when combined with the walk.

Distance/Time 12km walk – round trip to the Park Office.

Begin your adventure leaving from the Park Office at 9.00am.

From the Garden of Eden pool, climb, walk and swim up the Eden River to the walking trails that wind around the valley to a series of waterfalls and rock pools perfect for swimming.

This secluded valley receives few visitors and is an ideal place for a picnic lunch, photography, exploring and enjoying the peace. After exiting the Deer Cave your Guide will show you Langs Cave then leave you at the Bat Observatory to wait for the Bat Exodus around dusk. It is a good idea to bring some dry clothes to change into to await the Bat Exodus.

You return to Park HQ at your leisure along the Rainforest Discovery Walk.

NOTE Heavy rainfall in the area may mean cancellation of this tour at short notice





Racer Cave (Intermediate level) (minimum of 3 persons maximum of 8 persons)

Total time

3 - 4 hours

Advance booking required

RM120 per person (includes longboat return from/to Park HQ)


Your Guide leads you through the cave climbing up and down the passageways with the aid of ropes. This cave requires some upper body strength but most people are successful. Enjoy the great feeling that comes with discovering your abilities and meeting a physical challenge.

Animal life in this dark place will amaze you; see insects that have evolved with curious shapes, replacing vision with long feelers to navigate in this underground world and Racer Snakes that have learned how to catch a meal as it flies past.



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

Total time

3 hours

Advance booking required

RM120 per person (includes longboat return from/to Park HQ)

This is a beautiful cave with many stalactites, stalagmites and wonderful examples of cave sediments. Equipped with helmets and torches you scramble over boulders and along ancient rivers beds. Experience the thrill of seeing this underground world by torchlight and the anticipation of what is around the next dark corner.

There is no climbing in this cave which makes this is a great adventure, ideal for family groups.



Clearwater/Wind Cave Connection (minimum of 3 persons)

  Advance booking required

RM185 per person (includes longboat return from/to Park HQ)

(Advanced Level – requires Park Manager approval)

Clearwater Connection is a 4.8km long trip and takes 6 to 8 hours to complete.

Beginning in the show cave section of the Cave of the Winds adventurers leave the tame pathways behind and venture into the ‘wild’ chambers over rugged terrain strewn with boulders that requires some climbing up then clambering down muddy slopes and swimming back and forth across the underground river..

Areas that are hazardous have fixed ropes and guides carry personal ropes to assist you in sections that require climbing.

For many the 1.5km river section is the highlight as it is exceptionally beautiful and refreshing after the hard caving.




Sarawak Chamber (Advanced) (minimum of 3 persons)

Advance booking required

RM250 per person

(Advanced Level requires Park Manager approval)

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.

If during the trek to the cave entrance the guide believes that water levels will be too high in Sarawak Chamber but still suitable at Drunken Forest then the tour will be changed at no extra charge.


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