With a name that translates as “The Mountain with Three Hundred Peaks”, KHAO SAM ROI YOT NATIONAL PARK, with its northern entrance 28km south of Pak Nam Pran beach or 63km from Hua Hin, encompasses a small but varied, mosquito-ridden coastal zone of just 98 square kilometres. The dramatic limestone crags after which it is named are the dominant feature, looming 600m above the Gulf waters and the forested interior, but perhaps more significant are the mud flats and freshwater marsh which attract and provide a breeding ground for thousands of migratory birds. Bird-watching at Thung Khao Sam Roi Yot swamp is a major draw, but the famously photogenic Phraya Nakhon Khiri cave is the focus of most day-trips, while a few decent trails and a couple of secluded beaches provide added interest.

Orientation in the park is fairly straightforward. One main inland road runs roughly north–south through it from the R3168 (the road from Pranburi’s main junction to Pak Nam Pran), passing, in order: the 2km side road to Hat Phu Noi, a quiet, golden-sand beach that offers several resort alternatives to the park’s accommodation and the chance to see dolphins in the cool season; the northern park checkpoint, 4km further on; the turn-offs for Ban Bang Pu (the jumping-off point for Tham Phraya Nakhon), Ban Khung Tanot (for Tham Sai) and Hat Sam Phraya (all to the east); then going over Khao Daeng canal, before looping westwards around the main massif, past the park headquarters (where park brochures and maps are available) and the southern checkpoint (14km from the northern checkpoint), to Highway 4 at kilometre-stone 286.5.

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