Gunung Leuser National Park

Gunung Leuser National Park is part of the Tropical Rainforest Heritage of Sumatra UNESCO World Heritage Site, spanning the border of North Sumatra and Aceh provinces. It's one of the last places on Earth where Sumatran orangutans, elephants, tigers, and rhinos coexist in the wild. The park is named after Mount Leuser (3,119 m) and covers over 1 million hectares. Bukit Lawang and Ketambe are the main gateways for trekking.

Access is from Medan — bus to Bukit Lawang (3 hours) for the North Sumatra side, or to Ketambe (via Kutacane, 6 hours) for the Aceh side.

Guided jungle treks (half-day to multi-day). Trekking is strenuous but rewarding.

Semi-wild orangutans at the Bukit Lawang feeding platform. Rafflesia arnoldii and other rare flora. Thomas leaf monkeys, hornbills, and the jungle ecosystem. Rivers and waterfalls within the park.

Multi-day trekking with a licensed guide. River tubing. Camping overnight in the jungle. Night walks.

Meals are provided by trekking operators. Simple Indonesian food.

Bukit Lawang has budget to mid-range guesthouses. Ketambe has basic eco-lodges and homestays. Camping inside the park is available on multi-day treks.

Bukit Lawang (3 hours from Medan). Ketambe (6 hours from Medan). Lake Toba (4 hours from Medan).