Eight hours south of Sintang, Bukit Baka-Bukit Raya National Park, named for two of Kalimantan's highest peaks, offers extraordinary montane forest vistas, breathtaking waterfalls, meandering rivers, giant rafflesia blooming every March, and barely any tourist facilities. Reach the sprawling 181,000 hectare Schwaner Range reserve by 4WD from Nanga Pinoh or boat from Nanga Popai.
From Palangka Raya in Central Kalimantan, get there combining road, river and trekking via Tumbang Jatuh, Tumbang Manggu and Tumbang Gagu. To visit, contact the park office.