Sirindhorn Peat Swamp Forest Nature Research and Study Centre

Pa Phru Sirindhorn, in Su-ngai Kolok district of Narathiwat province, protects Thailand’s largest remaining peat swamp forest — a waterlogged habitat built up from thousands of years of decomposed organic matter, distinct from the country’s rainforests. A 1,200-metre elevated boardwalk, including a suspended-bridge section and a canopy viewing tower, lets you walk over the swamp without disturbing it. Entry is free and the centre is open daily, 08:00–16:00.

The walkway starts behind the research centre and threads between trees rooted in dark, tea-coloured water. Records from the site list more than 195 bird species, 50 mammals, 30 reptiles and 470 plants across the wider 192-square-kilometre swamp system, though a single visit rarely turns up more than birdsong and the odd kingfisher — this is a habitat walk, not a guaranteed wildlife encounter. The forest is named for Princess Maha Chakri Sirindhorn, who first visited the site in 1990; locals still call it Pa Phru To Daeng, after an older village legend.

Insider Tip: Go early. Heat builds fast on the exposed boardwalk sections by mid-morning, and bird activity drops off once the sun is high.

Watch out: Narathiwat sits in Thailand’s deep south, where decades of separatist insurgency have brought increased-caution travel advisories from several foreign governments. Attacks are directed almost entirely at military, police and government targets, not tourists, but check current advice before booking and read the fuller picture on our Narathiwat guide.

Bring drinking water and insect repellent — the humidity is constant and there’s no shop on the trail. For more on the province and its current travel context, see our Narathiwat hub. Nature-focused travellers heading further into the province can also combine this with Hala-Bala Wildlife Sanctuary or Budo-Su-ngai Padi National Park, both further inland rainforest reserves.