🏞️ Scenic

Tham Phraya Nakhon

📍 Prachuap Khiri Khan, Sam Roi Yot

A collapsed cavern open to the sky, where a single golden royal pavilion stands in a shaft of sunlight that pours through the ceiling each morning — reached by a steep climb and a short boat ride along a national-park coast.

Inside the dramatic limestone headlands of Khao Sam Roi Yot National Park, the roof of a great cave has collapsed, letting trees and sky into a sunken green chamber. At its centre stands the Kuha Karuhas Pavilion, a delicate golden royal sala built for a king’s visit in 1890.

Why It’s Interesting

For a short window each morning, sunlight angles down through the cavern’s open ceiling and lands directly on the pavilion, lighting it like a spotlight while the rest of the cave stays in shadow. It’s one of Thailand’s most photographed natural-and-built marvels — and earning it takes effort: a boat hop along the coast and a steep scramble up the headland to the cave mouth.

Best Time to Visit

The light beam is best on clear mornings around 10:00–10:30, and the cool, dry season gives the clearest skies (and the most comfortable climb).

Getting There

Drive to Bang Pu village near Sam Roi Yot, then take the short longtail boat (or walk the beach path) to the trailhead and climb the 430-metre ascent to the cave.

📸 Mon-chan's camera roll

Snapshots from our very good boy on the road.

Mon-chan visiting Tham Phraya Nakhon — Waited for the sunbeam to hit the little hall. Magic.

Cinnamon at Tham Phraya Nakhon — Cinnamon stood in the spotlight like he owned it.

🏞️ Scenic 🌲 Nature 📜 History 🔭 Viewpoint 📷 Photography 💎 Hidden Gem 🌄 Outdoor

Need to know

Best time: 🌤️ Cool Season Peak: Jan, Feb, Nov, Dec The famous light beam hits the pavilion on clear mornings, roughly 10:00–10:30; cool-season skies give the best odds.
Cost: Khao Sam Roi Yot National Park entry; boat from Bang Pu beach is a small extra.
Time needed: Half day
Effort: Challenging
Parking: Park at Bang Pu village; the cave is reached on foot (and usually a short boat hop).
Transit: 🚆 Hua Hin / Pranburi + car (~40–60 km), then boat or beach walk No public transport to the trailhead — drive, then take the longtail boat or coastal path.
Accessibility: ♿ Not accessible A steep 430-metre rocky climb to the cave mouth; not suitable for limited mobility.
Dog friendly: 🐕 No

🗺️ Open in Google Maps

Source: Editorial

Last updated June 19, 2026

References: Phraya Nakhon Cave — Wikipedia

Where it is

📜 History

Hellfire Pass Memorial

A deep rock cutting on the WWII 'Death Railway,' hewn by hand by Allied POWs and Asian labourers under unimaginable conditions — now a moving memorial and forest walk along the vanished tracks, with one of Asia's most thoughtful museums.

📍 Kanchanaburi, Sai Yok 🎫 Donation ⏱ Half day

🌤️ Cool Season

🛕 Temple & Shrine

Khao Chi Chan (Buddha Mountain)

A 109-metre golden Buddha laser-etched and gold-inlaid into the sheer face of a limestone cliff — a serene giant gazing out over a lake and lotus garden, created to save the scarred quarry mountain from further blasting.

📍 Chonburi, Sattahip 🆓 Free ⏱ ≈ 1 hour

🌲 Nature

Don Hoi Lot

A vast sandbar at the mouth of the Mae Klong River, famous for its colonies of razor clams — at low tide locals wade out to harvest them, and a strip of seafood shacks serves the catch within metres of where it was dug.

📍 Samut Songkhram, Mueang Samut Songkhram 🆓 Free ⏱ Half day

🌞 Hot Season

🛕 Temple & Shrine

Wat Bang Kung (The Temple in the Tree)

A small Ayutthaya-era ordination hall completely swallowed by the roots of four enormous banyan and bodhi trees — the living wood now forms the temple's outer walls, with a Buddha image glowing in the green gloom inside.

📍 Samut Songkhram, Bang Khonthi 🆓 Free ⏱ ≈ 1 hour

Nearby discoveries

🛣️ Roadside

Maeklong Railway Market

A fresh market that does business directly on a live railway track — and several times a day, as a train rolls through inches from the produce, vendors calmly fold back their awnings and pull in their baskets, then reset the moment it passes.

📍 Samut Songkhram, Samut Songkhram 🆓 Free ⏱ ≈ 1 hour · 134 km away

🦊 Animals

Wat Khao Chong Phran (The Bat Cave Temple)

Every evening at dusk, an unbroken river of millions of wrinkle-lipped bats pours from a cliff cave beside this Ratchaburi temple for nearly an hour — one of the great wildlife spectacles of central Thailand.

📍 Ratchaburi, Photharam 🎫 Donation ⏱ Half day · 153 km away

🏞️ Scenic

Khao Ngu Stone Park

A reclaimed limestone quarry turned tranquil park, where emerald flooded pits sit beneath sheer cliffs — one of them carved with an ancient Dvaravati-era Buddha relief, reached by a short climb to a breezy viewpoint.

📍 Ratchaburi, Mueang Ratchaburi 🆓 Free ⏱ Half day · 154 km away