About

Beyond the Horizon: Sumatra’s Last Great Wilderness

Protecting, preserving, and sharing the ancient ecosystem of Mount Leuser National Park with travelers from around the globe.

The Realm of the Big Four

The Only Place in Indonesia Where the Four Megafauna Coexist

Mount Leuser National Park is not just a protected forest; it is a living biological fortress. Spanning over 800,000 hectares across Northern Sumatra and Aceh, it holds a distinction shared by no other national park in Indonesia—or anywhere else on Earth.

It is the only remaining habitat on the planet where the four iconic Sumatran megafauna still roam free together in the wild:

  • The Sumatran Orangutan: Swinging through the high dipterocarp canopies.
  • The Sumatran Tiger: The elusive apex predator roaming the primary rainforest floors.
  • The Sumatran Elephant: Moving along historic river valleys and ancient migratory corridors.
  • The Sumatran Rhinoceros: Nestled deep within the park’s most untouched, high-altitude sanctuaries.

When you step into this UNESCO World Heritage site, you are stepping into an intact prehistoric ecosystem where wild nature still operates on its own terms.

Beyond the Name

More Than a Single Peak: The Leuser Massif & Mount Kemiri

While the park derives its name from Mount Leuser, the park encompasses an extraordinary collection of mountain ranges, deep river valleys, coastal swamps, and cloud forests stretching across two provinces.

Exploring Leuser means understanding that its true magic lies in its incredible geographic diversity:

  • The Leuser Tripeak: Located in the remote western interior of Aceh, this sacred mountain requires multi-day expedition treks through the wild Sumatran rainforests to reach its three summits; Puncak Leuser (3,161 MASL), Puncak Loser (3,413 MASL), and Puncak Tanpa Nama (3,477 MASL)
  • Mount Kemiri: Soaring even higher than the Leuser peak itself at 3,314 MASL, Mount Kemiri stands as one of the most imposing summits in the entire Barisan range. Its high-altitude moss forests, subalpine ridges, and dramatic cloudlines represent the true alpine wilderness of the park.
  • The Alas River Valley: Cutting through the heart of the park, this powerful river acts as the lifeblood of the lowland rainforest, dividing the wilderness and providing vital hydration to thousands of species.

From the lowland canopy of Bukit Lawang and Ketambe to the moss-draped peaks of Kemiri and Leuser, this park is a vast, interconnected realm waiting to be explored.