Twin Islets, One Perfect Channel of Blue

Two uninhabited islands, a narrow coral channel between them, and water so clear you’ll want to stay in it all day—Koh Rok is the Andaman at its most effortless.

Why Go

Koh Rok is actually two islands—Koh Rok Nai and Koh Rok Nok—set inside Mu Ko Lanta National Park. Think white-sand crescents, reef shelves close to shore, and a calm “park-island” atmosphere watched over by rangers.

What makes it special for yacht guests is simplicity: anchor, swim, snorkel, repeat—then enjoy lunch with the channel as your view.

Travel Time from Phuket

Koh Rok sits south of Koh Lanta (often described as ~30 km south), so travel time from Phuket depends on whether you run direct or via the Lanta corridor.

Typical planning ranges:

• Private yacht cruise (18–22 knots): ~2.5–3.5 hours
  
• Speedboat (28–35 knots): ~1.5–2.25 hours
  

Timing varies with sea conditions and departure point.

Best Time to Visit

For the brightest water and the easiest snorkelling, November to April is typically the sweet spot—calmer seas, better light, and more consistent visibility for reef time around the islands.

Seasonal Access & Closures

Koh Rok is managed as part of a marine national park, and seasonal closures help protect reefs and improve safety during monsoon months.

• Typical closure window for smaller park islands (including Koh Rok): 16 May – 14 October each year (dates can shift with conditions).
  
• E-ticketing (announced): From 15 Oct 2025, Thailand will require e-tickets for entry to six southern marine parks, including Mu Ko Lanta National Park—plan a little earlier for smooth entry.
  
• National park fees (DNP schedule, updated 2 Jun 2023): Mu Ko Lanta NP is listed at 40 THB (Thai adult) / 20 THB (Thai child) and 200 THB (foreign adult) / 100 THB (foreign child), with the Koh Rok / Koh Ngai / Koh Haa / Hin Daeng–Hin Muang area shown at 400 THB (foreign adult) / 200 THB (foreign child).
  

Top Things to Do

• Snorkel the reef shelves where coral sits in easy-to-enjoy depths
  
• Swim the channel between Rok Nai and Rok Nok—often described as about 250 meters wide
  
• Beach time on soft sand with that “uninhabited-island” quiet
  
• Add a second snorkel stop on the outer reef edge (conditions permitting)
  
• Enjoy a simple ranger-area lunch—or dine onboard for the most private experience
  

Signature Spots

• The 250 m Channel: Koh Rok’s most iconic snorkel swim, often packed with colour in peak season
  
• Hat Man Sai / ranger area (Koh Rok Nai): the classic “park stop” for a beach break
  
• Outer-island shallows (Koh Rok Nok): a quieter feel and dreamy water colour, especially earlier in the day
  

Suggested Yacht Itineraries

Day Trip (Blue-Water Highlight Day)
Phuket → Koh Rok channel snorkel → beach time + lunch onboard → second snorkel point → sunset cruise back.

Overnight (The Quiet-Luxury Upgrade)
Day 1: Arrive late afternoon for soft light and calmer bays → dinner onboard at anchor.
Day 2: Early snorkel session before most day tours → unhurried cruise home.

Island Hopping (Rok + Lanta Circuit)
Phuket → Koh Lanta overnight → Koh Rok day → optional Koh Haa or Koh Ngai routing (season/park rules permitting) → return.
With Clyde Andaman, Koh Rok is ideal as a “signature day” within a longer itinerary—more timing control, more comfort between stops, and the freedom to follow the clearest water.

Quick Tips for a Smooth Visit

• Plan a morning arrival for calmer surface conditions and cleaner light
  
• Use park-friendly positioning (moorings where provided, sand patches where appropriate) to keep reefs thriving
  
• Keep a flexible swim list—your captain can choose the best side of the islands for the day’s conditions
  
• Pack a dry bag and easy slip-on footwear for tender-to-beach moments
  

FAQ

Are the Rok Islands part of a national park?
Yes—Koh Rok sits within Mu Ko Lanta National Park.

How far apart are Koh Rok Nai and Koh Rok Nok?
They’re often described as about 250 meters apart, separated by a snorkel-friendly channel.

When is Koh Rok closed?
Most years, smaller islands in the park (including Koh Rok) follow a 16 May – 14 Oct closure window, with exact timing influenced by seasonal conditions.

How long from Phuket by private yacht?
Typically 2.5–3.5 hours, depending on route, sea state, and departure marina.

Do we need e-tickets?
An e-ticket system has been announced from 15 Oct 2025 for six southern marine parks, including Mu Ko Lanta National Park—confirm the current process when planning.

เกาะรอก (Koh Rok Nai & Koh Rok Nok) เป็นหมู่เกาะคู่ที่น้ำใสสีฟ้าจัดและเหมาะมากสำหรับดำน้ำตื้น โดยมี “ร่องน้ำ/ช่องแคบ” ระหว่างสองเกาะเป็นไฮไลต์ยอดนิยม ช่วงที่เที่ยวสวยและทะเลมักนิ่งที่สุดโดยทั่วไปคือ พ.ย.–เม.ย. และมีช่วงปิดตามฤดูกาลของอุทยาน (มักราว 16 พ.ค.–14 ต.ค. ควรเช็กประกาศก่อนเดินทาง) เวลาเดินทางจากภูเก็ตด้วยเรือยอชต์ส่วนตัวโดยเฉลี่ยประมาณ 2.5–3.5 ชั่วโมง ทั้งนี้ขึ้นกับสภาพทะเลและจุดออกเรือ