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Home  /  Malaysia  /  Mulu
UNESCO caves & karst · Sarawak, Borneo

Mulu

Borneo's cave wonderland — vast chambers, the dusk bat exodus, and pinnacled karst.
Getting there
Fly into Mulu (MZV) from Kota Kinabalu or Miri
Best for
The bat exodus, the world's great caves, the Pinnacles, rainforest and karst
The land
A UNESCO landscape of vast caves, limestone pinnacles and rainforest in Sarawak
Good to know
The nightly exodus of millions of bats from Deer Cave is the signature spectacle
What it is
Mulu is Borneo's cave kingdom — some of the largest caves on earth, the famous bat exodus, and the razor Pinnacles above.
A UNESCO World Heritage Site, Mulu holds caves of staggering scale — Deer Cave and the Sarawak Chamber among the world's biggest — and each evening up to three million bats spiral out of Deer Cave in ribbons against the sky. Above ground, the sharp limestone Pinnacles and lush rainforest complete one of Borneo's great natural showcases.
Mulu National Park — unesco caves & karst.
The reason to come

Caves and the bat exodus

Mulu's spectacles are subterranean and aerial — the great caves, and the bats that pour from them at dusk.

The bat exodus

Millions of bats spiralling from Deer Cave at dusk, hunted by bat hawks.

Show caves

Deer, Lang, Wind and Clearwater caves of immense scale and beauty.

The Pinnacles

The razor limestone spires, for the fit and adventurous.

Worth knowing

Caves like cathedrals

Mulu's chambers are among the largest underground spaces on the planet — and the bat exodus is unforgettable.
The bat exodus spiralling from Deer Cave at Mulu.
When to come — honestly

A year-round cave park.

March – September
Best
Drier months — best for caves, trails and the Pinnacles climb.
Year-round
Good
The caves and bat exodus run all year; heavy rain can affect access.
The bat exodus depends on the weather (rain can cancel it); the Pinnacles climb is strenuous and not for everyone.
Context

Karst on a grand scale

Mulu's caves and karst are a UNESCO natural wonder, with the bat exodus as its signature wildlife moment.

It is the scenic and spectacle high point of a Sarawak journey.

We include Mulu for the caves and the bat exodus, the grand finale of Sarawak.

Beyond the obvious

More to Mulu National Park.

Bat exodus

Bat exodus

At the Deer Cave mouth at dusk.

Show caves

Show caves

The great chambers by walkway.

Pinnacles trek

Pinnacles trek

The sharp karst spires, for the fit.

Why Wild Voyager

We get you to the right forest at the right time.

From river lodges to night-drive reserves, we match the parks and guides to your targets — orangutans, clouded leopards or ten species of hornbill.

Handpicked lodges

We choose the lodge and guiding that fit your dates and targets, not whatever is left.

We time it right

We build your visit around the season and the displays that deliver.

Journeys

Trips through Mulu

8 Days · 7 Nights

Sarawak Wildlife Journey
15 Days · 14 Nights

Ultimate Malaysia Wildlife
Where to stay

Where you’ll stay in Mulu

Signature Collection
PhotoMulu Marriott Resort & Spa
Signature

Mulu Marriott Resort & Spa

A polished resort by the Melinau river, the comfortable base for the Mulu caves.
Classic Collection
PhotoMulu National Park Lodges
Classic

Mulu National Park Lodges

Park-run lodging at the Mulu HQ, closest to the caves and the bat exodus.

Plan your Mulu National Park journey.

Explore the great caves and watch the dusk bat exodus. Tell us your dates and we will build the route around it.

Plan a Mulu National Park trip

Field notes, now and then.

Where to go · When to go · Wildlife in season

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