The Mulu Show Caves are the most accessible caves in Gunung Mulu National Park, a UNESCO World Heritage Site in Sarawak, Malaysia. Open to visitors through guided tours and boardwalk trails, these caves reveal vast limestone chambers, underground rivers, and striking rock formations within one of Borneo’s most extraordinary cave systems.

The four main show caves are Deer Cave, Lang Cave, Wind Cave, and Clearwater Cave, each offering a glimpse into Mulu’s ancient underground landscape. Many visitors explore these caves as part of a wider journey through the park, which may also include the challenging Mulu Pinnacles trek or a visit to the Batu Bungan Penan Settlement along the Melinau River.

Highlights

• Explore Deer Cave, home to one of the largest cave passages in the world
• Witness the famous Bat Exodus, where millions of bats emerge at sunset
• Walk through Lang Cave, known for its delicate and unusual rock formations
• Discover Clearwater Cave, the longest cave system in Asia
• Experience Wind Cave, known for impressive stalactites and stalagmites
• Travel through well-maintained rainforest boardwalks, safe and accessible for visitors of all ages

The Four Mulu Show Caves

Deer Cave

Deer Cave is the largest and most famous cave in Gunung Mulu National Park. It contains one of the largest cave passages in the world, measuring more than 2 kilometres in length and over 100 metres in height.

Visitors enter through a massive cave entrance that opens into a cavern so large it is difficult to fully comprehend its scale. Inside the cave, boardwalks allow visitors to walk deep into the chamber while observing the immense limestone walls rising high above.

One of the most interesting features inside the cave is a rock formation known as the Abraham Lincoln profile, which resembles the silhouette of the former US president when viewed from certain angles.

Deer Cave is also home to millions of bats, which roost on the cave ceiling during the day. These bats become the stars of one of the park’s most famous natural events, the Bat Exodus that occurs each evening at sunset.

Lang Cave

Located just a short walk from Deer Cave, Lang Cave offers a smaller but visually stunning cave experience.

Lang Cave is admired for its intricate limestone formations, including delicate stalactites and stalagmites that have formed over thousands of years.

Among its most unusual features are rock formations that resemble jellyfish hanging from the cave walls, giving the cave a unique and almost otherworldly appearance. Carefully placed lighting highlights these formations, allowing visitors to appreciate the fine details of the cave’s mineral structures.

Wind Cave

Wind Cave is located along the Melinau River and is typically reached by boat from the park headquarters.

The cave gets its name from the cool natural airflow that moves through its narrow limestone passages. Inside, boardwalks lead visitors through tall chambers filled with impressive stalactites and stalagmites.

The steady airflow inside Wind Cave also makes the cave noticeably cooler than the humid rainforest outside.

Clearwater Cave

Clearwater Cave is one of the most remarkable cave systems in Gunung Mulu National Park. With more than 200 to 265 kilometres of explored interconnected passages, it is the longest cave system in Asia and one of the longest worldwide.

A clear underground river flows through the cave before emerging outside as a natural spring along the Melinau River. Visitors reach the cave by boat, followed by a climb up a staircase to the cave entrance.

After exploring the cave, many visitors relax by the riverside where the cool spring water offers an opportunity to take a refreshing swim, often during a lunch stop as part of the tour.

The Bat Exodus

One of the most unforgettable experiences in Gunung Mulu National Park is the Bat Exodus.

Each evening around sunset, millions of bats leave Deer Cave to hunt for insects in the surrounding rainforest. As they emerge, the bats form long swirling ribbons in the sky above the forest canopy.

This spectacular natural display can last several minutes and is widely regarded as one of the most remarkable wildlife events in Southeast Asia. Visitors can watch the Bat Exodus from a designated viewing area along the boardwalk outside Deer Cave.

How to Get to the Show Caves

The Mulu Show Caves are located within Gunung Mulu National Park and are accessed through guided tours organised by the park.

The caves are located in two main areas:

Deer Cave and Lang Cave

These caves are reached via a scenic 3-kilometre boardwalk trail through the rainforest from the park headquarters.

Wind Cave and Clearwater Cave

These caves are reached by longboat along the Melinau River, followed by short walking trails to the cave entrances. Many boat trips also pass the Batu Bungan Penan Settlement, where visitors can stop to browse handicrafts made by the local Penan community.

All cave visits are conducted as guided tours organised by the national park.

What to Expect

Visitors explore the caves through a network of well-maintained boardwalks that run through the rainforest and extend into the cave interiors. These walkways make the caves safe and accessible for visitors of all ages, from young children to seniors.

Because of this infrastructure, Gunung Mulu National Park is widely considered one of the most accessible and family-friendly national parks in Malaysia, allowing travellers to experience extraordinary cave systems without technical caving equipment.

Visitors should expect moderate walking, humid cave conditions, and occasional sightings of wildlife such as bats and cave-dwelling insects. Comfortable walking shoes and light clothing are recommended due to the warm rainforest climate.

Many travellers explore the show caves before embarking on more challenging adventures in the park, such as the trek to the Mulu Pinnacles.

Best Time to Visit

The Mulu Show Caves can be visited throughout the year, as Gunung Mulu National Park is a year-round destination. Located within a tropical rainforest climate, rainfall can occur in any month, helping to sustain the lush ecosystems that make the park so unique.

Historically, the period between March and October tends to be slightly drier compared to the rest of the year. However, the difference in rainfall is not particularly significant, and visitors can comfortably explore the caves in any season.

Even on days when rain occurs, showers are typically short and intermittent rather than lasting the entire day. Activities such as cave tours and rainforest walks usually continue as scheduled, and the surrounding rainforest often appears especially vibrant after rainfall.

Other Experiences in Gunung Mulu National Park

The Mulu Pinnacles are sharp limestone spires rising dramatically from the rainforest canopy on Gunung Api. Reaching the viewpoint requires a challenging jungle trek, but the reward is one of the most spectacular landscapes in Borneo.

Located along the Melinau River, the Batu Bungan Penan Settlement is a small village where visitors can learn about the traditional forest lifestyle of the Penan community and browse handmade crafts such as baskets and beadwork.