Ko Ra Thian (Ko Ra Thian) is a small island located near the coast of Choeng Mon Beach on the northeast of Koh Samui. It stands out as a secluded island that has not been commercially developed, preserving its pristine and tranquil natural state, making it ideal for those seeking to escape the hustle and bustle of major tourist attractions.

The main highlight here is the fine white sandy beach that contrasts with the clear emerald green seawater, allowing you to see the sandy bottom, rock formations, and small schools of fish with the naked eye. The island is also surrounded by uniquely shaped rocks formed by natural wave and wind erosion, creating distinctive and unique photo opportunities.

The area around the island has shallow coral reefs that remain abundant, making it ideal for snorkeling. You can find various types of fish, such as damselfish, parrotfish, and small marine life among the rocks. It's also great for kayaking around the island to see the cliffs and small hidden coves.

Inside the island, there is also a short nature trail where you can explore local flora and climb to a cliffside viewpoint, offering beautiful sea views of the eastern side of Samui. Especially on clear days, you can see distinct shades of blue in the sea.

Between 10:00 AM – 3:00 PM, sunlight directly hits the water's surface, creating sparkling emerald reflections around the island, perfect for taking both aerial and beach-level photos, as well as enjoying a private picnic amidst the sound of the waves and a peaceful atmosphere.

Since there are no facilities, shops, or accommodations here, it feels like a truly private island. Tourists typically come for a half-day trip, whether they are photography enthusiasts, nature lovers, or couples seeking a quiet and romantic atmosphere.

Ko Ra Thian is considered one of the Hidden Gems of Koh Samui, preserving its original beauty, ideal for those who want to experience nature up close with a simple yet valuable travel experience.

• Longtail Boat: Hire a boat from Choeng Mon Beach or Bang Rak Beach. The journey takes approximately 10–15 minutes.

• Kayaking: On calm days, you can rent a kayak from Choeng Mon Beach and paddle across (check the weather conditions before traveling).

• The best time to visit is 10:00 AM – 3:00 PM when the seawater is clearest and most beautiful.

• Bring your own drinking water and food as there are no shops.

• Pack snorkeling gear to view the coral and schools of fish near the shore.

• Take your trash back with you to help maintain the cleanliness of nature.

• Check the wave conditions before kayaking for safety.

Admission Fee:

• Free admission (only boat hire or kayak rental fees apply).

Opening Hours:

• Recommended visiting hours: 8:00 AM – 5:00 PM.
  (Overnight stays are not recommended due to the lack of facilities.)