Khao Sam Roi Yot National Park

Khao Sam Roi Yot National Park is a coastal protected area in Prachuap Khiri Khan province on Thailand’s Gulf Coast. The park protects limestone hills, coastal plains, marshes and mangrove habitat.

The area was designated a national park to protect its coastal karst landscape and wetlands; management has focused on habitat conservation and regulated public access. Local communities historically used the coastal zone for fishing and small-scale agriculture prior to formal protection.

The park sits on the Gulf of Thailand coast in Prachuap Khiri Khan province, with park entrances and visitor points along the shoreline. It lies within easy reach of provincial towns on the southern central Thai coast.

• Best time: Dry-season months from roughly November to February offer the most comfortable weather for trails and cave visits.
• Access: Trails and boat landings are used to reach key sights; expect some short hikes and stair sections to reach caves and viewpoints.

What to See#

• Phraya Nakhon Cave: A sea cave with a large chamber that contains the iconic royal pavilion visible when sunlight enters through the cave mouth; reached by a short walk and stair passage from the park entrance.
• Laem Sala Beach: A shoreline area of sand and reef that serves as a common landing point for boats and the trailhead to nearby viewpoints.

• Plan to visit Phraya Nakhon Cave at first light - the shaft of sunlight on the royal pavilion is best early and you'll beat the mid‑day tour groups and heat.
• Don't skip the Thung Sam Roi Yot freshwater marsh boardwalk: it's a top spot for waders and migratory birds, especially around low tide and in the cooler months.
• To save time on the coastal approach to Laem Sala and the cave, ask locally about the park's boat crossings across the bay - taking a short boat ride cuts much of the seaside walk and reduces exposure to sun and heat.