Sumatra : Geography, Cultures and Biodiversity — everything you should know before to travel

Sumatra. The name alone conjures something vast, mysterious, and alive. At 475,000 km², this Indonesian island is the sixth largest in the world — and one of Southeast Asia's most extraordinary nature destinations. Jungle trekking, wild orangutan sightings, and immersion in ancient cultures: Sumatra is a destination in its own right, too often overlooked in favour of Bali.

I live in Bukit Lawang, in the heart of North Sumatra. As a conservation biologist, I know this island intimately. And every day spent here reminds me how inexhaustible it truly is.

Gunung Leuser National Park: the green heart of Sumatra

In North Sumatra lies one of Asia's richest and best-preserved rainforests: Gunung Leuser National Park, a UNESCO World Heritage Site. Covering over one million hectares, this sanctuary shelters species found nowhere else on Earth. The critically endangered Sumatran orangutan lives here — alongside the Sumatran tiger, Sumatran elephant and Sumatran rhinoceros.

Bukit Lawang, the village where I live and work, is the park's main gateway. It is one of the only places in the world where you can observe orangutans in their natural habitat, in the wild, on an ethical jungle trek. An experience that stays with you forever.

Geography: a world island between volcanoes and ocean

Sumatra stretches over 1,700 kilometres from northwest to southeast, bisected by the Bukit Barisan volcanic range. The island is home to Lake Toba — the world's largest volcanic lake, coral-fringed coastlines, and millions of hectares of humid tropical rainforest.

For nature lovers, trekkers and wildlife enthusiasts, Sumatra is unrivalled. Its biodiversity ranks among the highest on the planet.

A cultural mosaic: Batak, Minangkabau, Karo and beyond

Sumatra is not one culture — it is a mosaic. Over a dozen major ethnic groups call the island home: the Batak people around Lake Toba, the Minangkabau of West Sumatra (the world's largest matrilineal society), the Acehnese of the north, and the Karo people of Berastagi. Each has its own traditions, music, food and architecture.

Travelling with Wild Nature Trips means diving into this cultural richness — meeting families, sharing traditional meals, and understanding the deep bonds between these communities and the surrounding forest.

Why choose Wild Nature Trips for your Sumatra trekking experience

I don't sell a destination. I share a place I love and know deeply, as a biologist, a resident, and a community member. Every stay is a genuine immersion: into the jungle, the wildlife, the local culture, with the smallest possible footprint and full respect for the environment.

Orangutan trekking in Bukit Lawang, wildlife observation in Gunung Leuser National Park, cultural immersion in North Sumatra villages: contact me to build your tailor-made trip.

Sumatra is waiting for you. It is unlike anywhere else on Earth.