Koh Tachai Closed: Why, Current Status and What to Do Instead

Featured image: Tubtim.r, CC BY-SA 4.0, via Wikimedia Commons.

Koh Tachai Closed: Current Status

Koh Tachai is closed to tourists. Thailand's Department of National Parks, Wildlife and Plant Conservation shut the island in May 2016. Its director general, Tunya Nethithammakul, told CNN the closure was "indefinite". We found no reopening announcement from that office. Treat any listing that sells landings on the island as out of date until the national parks authority says otherwise.

Some travel platforms still show an automatic label such as "open year-round" next to Koh Tachai. That label is a template field, not a park notice. User posts on the same pages, some dated years after the closure, still ask when the island will reopen. Only the park authority can change the island's status.

• Status for November 2026: closed to tourist visits, no public reopening date.
• Source of record: Department of National Parks, Wildlife and Plant Conservation (DNP) and Mu Ko Similan National Park.
• Island location: northernmost of the Similan Islands, in Phang Nga waters of the Andaman Sea.

Why Koh Tachai Was Closed

Officials blamed visitor numbers. Nethithammakul said the island could take "just a few hundred tourists a day". At some points almost 2,000 people landed daily. That is roughly four to ten times the stated capacity.

He listed several problems. Litter and food waste built up on the beach. Gasoline from tour boats leached into the water. Coral was damaged. Koh Tachai sits about 85 miles (137 km) northwest of Phuket and has no hotels, so nearly everyone came as a day visitor and ate lunch on the island. That concentrated the pressure into a few midday hours.

Boat fuel, anchoring and trampling all hit reef health at once. Our guide to Thailand's coral reefs explains how that damage builds up and why recovery is slow.

Closed vs. Seasonal Closure: Don't Mix Them Up

Two different closures affect Similan trips. Koh Tachai's closure is indefinite and applies all year. The monsoon closure is a yearly pause. Nethithammakul noted in 2016 that many Similan islands would have closed soon anyway for the monsoon season, along with other coastal national parks.

A seasonal reopening does not reopen Koh Tachai. If an operator says Tachai is "open again after the rainy season", treat that as a red flag. Season dates for the rest of Mu Ko Similan National Park change from year to year. Check them on the park's official notices before you plan around any month.

Also separate two other questions. A ban on landing is not the same as a ban on passing by boat. Whether boats may anchor, snorkel or dive near Tachai is set by the park authority. Do not accept an operator's word for it.

What You Can Do Instead

Trips to the open Similan islands are the closest substitute. Operators sail from the Phuket and Khao Lak areas. Itineraries change every season, so ask for the list of named islands in writing. Marine conservation work is a second option if you want to give something back to the reef.

How to Check Before You Book

Old posts and some sellers still use the Tachai name because it draws clicks. Run through this list before paying a deposit. Each step takes a few minutes and avoids a refund fight.

• Ask the operator for the exact island list and the landing stops. A genuine itinerary will not promise Koh Tachai.
• Read the park notices from the DNP or Mu Ko Similan National Park for current season dates and rules.
• Check the booking terms for cancellation if the park closes a site for weather or conservation reasons.
• Distrust photos of Tachai's beach used as proof of a current tour. They are often years old.
• Pay through a platform or card with a dispute process, not by cash transfer to a social media account.
• Walk away if staff say a "special permit" allows landings. Ask for the permit number and check it with the park.

Will Koh Tachai Reopen?

Nobody has announced a date, and officials described the 2016 closure as indefinite. Avoid speculation and look for official signals. Those include a park notice naming Tachai, a published visitor cap, and a monitoring report on the reef.

Maya Bay offers a comparison. Thailand closed it in 2018 to let the reef recover, and it later reopened with limits on visitors. Check the current rules there before you rely on that precedent. It shows closures can end, but only after a recovery plan, not on demand.

Coral recovery depends on temperature as well as foot traffic. Our guide to coral bleaching in Thailand covers the heat stress that can undo gains. You can follow ocean heat alerts at NOAA Coral Reef Watch.

Visiting Responsibly

Skip operators who ignore park rules, and choose boats that do not anchor on coral. Use mineral sunscreen; our reef-safe sunscreen guide lists what to look for. Joining a Dive Against Debris in Thailand: Course, Cleanup Dives and How to Join survey turns a trip into cleanup work. Tachai's story shows what happens when thousands land on a small island each day, so keep your own group small and your rubbish with you.