Khao Sok National Park protects 739 square kilometres of Thailand's oldest evergreen rainforest, a 160-million-year-old ecosystem older than the Amazon. The park straddles the Phuket and Tenasserim mountain ranges in Surat Thani Province, its limestone karsts rising 960 metres above the forest floor.
Monsoon rains average 3,500 millimetres annually, sustaining wild elephants, gibbons, sun bears, and the Rafflesia kerrii — a parasitic flower that blooms once a year at nearly a metre in diameter.
Cheow Lan Lake, created in 1982 by the Ratchaprapha Dam, submerged 165 square kilometres of valley and left a network of drowned peaks visible above the turquoise water. Long-tail boats cross the reservoir to floating raft houses and trailheads that lead into primary jungle. The forest canopy here reaches 65 metres, and hornbills glide between emergent Dipterocarpus and Hopea trees. Macaques forage along the shore, and barking deer appear at dusk near water sources.
Khao Sok tour 1 day itineraries typically begin with an 08:00 departure from nearby Phanom District, reaching the lake by 09:30 to avoid the midday heat that settles over the water by 13:00. Most programmes combine a boat crossing, a two-hour jungle trek on established trails, and a riverside lunch served on bamboo platforms. The park's trail system links viewpoints above the karst cliffs, caves inhabited by bats, and natural springs that feed the Sok River. Guides track recent animal sightings and adjust routes based on seasonal fruiting trees that draw primates and elephants.
The conservation fee of 300 baht per person, valid for 24 hours, funds trail maintenance and wildlife monitoring. Ranger stations at the main entrance and lakeside checkpoints record visitor numbers and enforce no-plastic regulations. The park closes daily at 16:30, requiring afternoon departures by 15:00 to clear the trails before dusk. The dry season from December to April offers the clearest lake visibility, while the wet months of May to November bring higher waterfalls and active wildlife near water sources.
7 hr
