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Exploring Diamond Cave at Railay Beach (Tham Phra Nang Nai)

Exploring Diamond Cave at Railay Beach (Tham Phra Nang Nai)

Olly Gaspar

By Olly Gaspar, full-time traveler for 6 years. I visit every place I write about & share real tips, photos, & advice from my trips.

A useful travel guide to visiting Diamond Cave, or “Tham Phra Nang Nai” at Railay Beach, Krabi, Thailand.

The Railay Peninsula is known for its impressive limestone features, world-class rock climbing, amazing beaches, and magnificent caves.

The Diamond Cave is a large grotto that is among the most famous in Railay and costs 200 Baht to enter. It features the best stalagmite and stalactite rock formations and makes for a worthwhile stop on your list of things to do at Railay Beach.

In this guide, I’ll break down everything you need to know about visiting the cave, including how to get there, what to expect, and some tips for your visit.

About Railay Beach's Diamond Cave

Diamond Cave, also known as Tham Phra Nang Nai in Thai, is a large, natural limestone cave at the northern end of East Railay Beach, Thailand. It is among one of Railay's three popular caves, which includes Princess Cave at Phra Nang Beach and the Railay Bat Cave.

The cave is near the famous Cave Resort at Railay East. It is a popular place to visit for those exploring the peninsula due to its spectacular rock formations and glimmering pool present in the rainy season.

The cave features a large, main cavern which is accessible via a narrow passageway leading to the edge of the limestone cliffs. The cave is also home to many bats. Expect to spend about 15-20 minutes in the cave.

Tip: Bring a tripod for extra stable photos in the cave as there are low light conditions.

Limestone cave rock formations at railay

How to Get to Railay Beach

Since the Diamond Cave is located in the southernmost Krabi Peninsula, then you'll first need to get to Railay.

Note, there are no roads to Railay Beach, so you'll need to get here via a short longtail boat ride from Ao Nang or Krabi Town (100 THB per person– must wait for 8 passengers to fill the boat).

Alternatively, to save money and time, many travelers choose to book a speedboat trip, combining a visit to Railay with a stop at the nearby Krabi Islands. Below are three more popular options.

Longtail boat at railay east beach
This part of Krabi is within Hat Noppharat Thara-Mu Ko Phi Phi National Park.

Where is the Diamond Cave at Railay?

Diamond Cave is located just an 8-minute walk north of Railay East Beach and just a 9-minute walk to the cave from the floating pier.

To get here from the floating pier:

  1. Walk north along the beach, turning left onto the main Railay Walking Street (corner of the "Welcome Back" restaurant).
  2. Take the first right after the Samonsi Take Away Restaurant & Shake Shop.
  3. Walk all the way down this road, passing the limestone walls until you see a large sign for the entrance of the cave.

The Google Maps pin is Diamond Cave / Phra Nang Nai Cave.

Below I've included a quick map to help you find it easily.

Getting to diamond cave from floating pier, railay beach
Map showing how to get to Diamond Cave from Railay Beach & Floating Pier
Walking street at railay beach

What to Expect at the Diamond Cave

Diamond Cave Entrance Fee: 200 Thai Baht

As soon as you arrive at the cave entrance, you'll notice a large shaded area where staff will be sitting to collect the entrance fee. They asked me for 200 Thai Baht, which I believe is supposed to go to the Phi Phi Island National Park.

After speaking with other travelers and reading some reviews of the cave online, I came to the conclusion that the entrance fee to Diamond Cave is negotiable. Many others have noted that you don't get a receipt for payment, so perhaps the staff are just pocketing the fee for themselves.

Regardless, I paid up and was waved toward the large, obvious entrance to the cave at the foot of the limestone cliff. There's also a grandiose signpost which is hard to miss.

Entrance to tham phra nang nai cave

The Cave Entrance & Passageway

The cave entrance is a tall, narrow passageway that is elevated above the cave floor. As soon as you enter, you'll notice a drastic drop in temperature, a cool shelter from the humid heat of Southern Thailand.

There are lights throughout the cave making it easy to see. However, it might be a good idea to bring your phone torch in case of power outs (which are common in Railay).

Narrow passageway at tham phra nang nai cave, railay, krabi
Rock formations at tham phra nang nai cave

The elevated platform is made of bamboo, wood, and concrete blocks, many of which are broken or loose– so watch your step. There are some nice stalagmite formations on the left, illuminated by the cave lighting.

Shortly after the entrance, the passage turns left, squeezing through a narrow section before opening up to the main cavern.

Diamond cave at railay beach, krabi

Main Cavern

The main cavern is a large, open space with a high ceiling and impressive limestone formations. These are large, hanging rocks formed by the eroding effect of water dripping from the mountains.

The walkway wraps around in a big loop, allowing visitors to walk around and peer into the other cave sections.

In the middle of this space, there is a large pool. Apparently, in the rainy season, this fills, reflecting the light onto the cave walls, creating a vibrant sparkling effect. This is where the name "Diamond Cave" comes from.

Railay diamond cave limestone formations

I spent about 15 minutes all up in this cave admiring the formations. During that time there were only two other visitors, and it was a nice experience being alone with the bats in the cave.

Diamond cave, krabi thailand

FAQ About Diamond Cave (Tham Phra Nang Nai)

How do I get to Diamond Cave at Railay Beach?

You can access Diamond Cave by a short longtail boat ride from Ao Nang or Krabi Town to Railay Beach, then an 8-minute walk from Railay East Beach, or a 9-minute walk from the floating pier.

What can I expect to see in Diamond Cave?

Expect impressive stalagmite and stalactite formations, a cool interior offering, and the possibility to spot bats. In the wet season, the main cavern features a pool that creates a sparkling effect on the walls, earning the cave its name.

Is it necessary to bring any specific gear or equipment for visiting the cave?

No special gear is required, but a flashlight or phone torch could be useful in case of power outages. Comfortable walking shoes are recommended for the uneven terrain inside the cave.

Where to Stay at Railay

Railay is a small peninsula with no cars or road transport. Therefore, you can walk to all the pristine beaches, where most of the best Railay Beach hotels and resorts are located. There are also a few budget backpacker hostels right on the beach.

Below are the top 3 places to stay in Railay for each budget.

Rayavadee outdoor views of the bungalow accommodation and swimming pool, krabi

1. Rayavadee Luxury

Known as one of the best resorts in Krabi. This 5-star luxury accommodation in Railay is famous for its epic cave restaurant. Boasts immaculately designed rooms, 6 restaurants, an outdoor pool, & incredible balcony views.

Tinidee hideaway villa accommodation on tonsai beach, thailand

2. Tinidee Hideaway Villa

Amazing sea-view villas overlooking the impeccable Tonsai Beach. The most romantic place to stay for couples. Features a beachside pool & world-class breakfast included.

Blanco hostel pool in railay

3. Blanco Hideout Budget

Easily the best backpacker hostel in Railay featuring a pool, two bars, a restaurant, a gym, and great common areas for sunbathing and meeting other travelers.

More Things to Do at Railay

I hope you've enjoyed this quick guide to visiting the Diamond Cave at Railay Beach, Thailand.

Before you go, make sure to check out some of my other popular Krabi travel guides from the list below.

Hidden beach, railay beach

Plan Your Krabi Accommodation

Still in the planning stages of your trip? Perhaps you're booking on the fly. The below accommodation guides will help you plan where to stay in Thailand.

Pinterest pin for the guide to visiting diamond cave
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I'm Olly Gaspar, adventure traveler from Australia. I’ve spent the last six years traveling the world full-time, sharing my first-hand experiences & photography in over 700 travel guides on We Seek Travel. I visit every destination I write about to bring you unique travel itineraries, epic hiking routes, fun tour ideas, travel & photography gear ideas, & interesting places to stay.

I only make genuine, worthwhile recommendations based on my experience, expertise, & research. If you buy through my links, I may get a commission, supporting this website at no extra cost to you. Read my Publishing Ethics Statement.