Kaeng Krachan National Park

Kaeng Krachan National Park, spanning Phetchaburi and Prachuap Khiri Khan along the Myanmar border, is Thailand’s largest national park at roughly 2,915 sq km. It was declared a national park in 1981 and became part of the Kaeng Krachan Forest Complex UNESCO World Heritage Site in 2021, recognized for one of Southeast Asia’s largest remaining stretches of unbroken evergreen forest. Entry costs 300 THB for foreign adults and 60 THB for Thai adults, plus a separate vehicle fee — not free, whatever older listings say.

The park’s terrain runs from the Kaeng Krachan Dam reservoir up through the Tenasserim range to Khao Phanoen Thung at 1,207 metres, with the higher, wetter forest sheltering wild elephants, gaur, king cobras, and reliably good birdwatching — hornbills in particular draw repeat visitors. Access splits into two very different experiences. The lower park, around the dam and reservoir, is reachable by ordinary car year-round and offers boat trips on the lake, short walking trails, and camping at established sites. The upper park, centered on Ban Krang campsite and the Phanoen Thung viewpoint — famous for its sea-of-mist sunrise — requires a steep, unpaved, 4WD-only road with controlled one-way timed access; independent travelers without a suitable vehicle typically hire a park 4WD truck at the entrance rather than attempt the climb themselves.

Watch out: The Ban Krang–Phanoen Thung zone is subject to seasonal closure, typically from August through October during the wettest months, and has also seen closures for road repairs outside that window. This is the single most important thing to check before planning a trip here — a two-day itinerary built around watching sunrise from Phanoen Thung can collapse entirely if the road is shut. Confirm current access with the park office rather than assuming the schedule from a previous year still applies.

Insider Tip: If your main goal is the sea-of-mist sunrise and you don’t want to gamble on 4WD access timing, book a trip through an operator who monitors the park’s current road status — it changes with weather and maintenance work more often than official sources update.

Getting to the park headquarters from Bangkok means driving via Phetchaburi town and Tha Yang junction onto Highway 3499, roughly a two-and-a-half to three-hour drive; there is no direct public transport to the park gate, so most independent visitors arrive by car, hired van, or an organized tour.

The Kaeng Krachan Dam and Khao Phanoen Thung pages cover the two halves of the park in more detail, and Phanoen Thung Sea of Mist Viewpoint has specifics on the sunrise trip. See the Phetchaburi hub page for the wider province.