Koh Ngai
A tiny Trang island with one long east-facing beach, no town and no roads, just turquoise shallows, coral you can swim to, and three islets in the view.
Details
Tours that include Koh Ngai
Skip-the-line entry, guided visits and day-tour combos around Koh Ngai.
Why go, and how to do it well
Koh Ngai (also written Koh Hai) is a small, jungle-covered island at the northern end of the Trang archipelago, close enough to Koh Lanta to sit on the island-hopping route between Lanta and Koh Lipe. Almost everything happens on one beach, a long, east-facing strip of soft white sand along the island's sheltered side, with shallow turquoise water, a coral reef within swimming distance of the shore and a view across to three small islets that make every photograph look arranged. There is no town, no road and no bank; a handful of resorts strung along the sand and a few rustic beach bars are the whole of it.
Days here are swimming, snorkeling off the beach, walking the sand at either end and watching hornbills in the trees behind. Longtail trips run to the Emerald Cave on Koh Mook and to Koh Kradan, the archipelago's other headline beach, both within half an hour. It suits couples and anyone who wants the beach with the noise turned off; it does not suit anyone who needs a choice of restaurants after dark.
Written by Mac Kiley · Updated Oct 2026
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Tours that include Koh Ngai
Skip-the-line entry, guided visits and day-tour combos around Koh Ngai.
Experience hints
Pair your visit. After Koh Ngai, round out your day in Koh Lanta with contrasting stops nearby.
Ko Lanta Yai, Kantang District
Open in Google MapsTips for Visiting Islands
Check Island Closures
Similan Islands, Surin Islands, and Koh Tachai close mid-May to mid-October. Some smaller islands reduce ferry service in monsoon season. Always verify schedules before planning your route.
Snorkel Gear Is Cheap to Buy
Rental gear is often scratched and ill-fitting. Buy a decent mask and snorkel at a Big C for 300–500 THB — cheaper than two days of rentals and much more hygienic.
Bring Cash to Smaller Islands
ATMs on smaller islands like Koh Kood, Koh Mak, and Koh Yao charge high fees and sometimes run out of cash. Withdraw enough on the mainland before heading over.
Koh Ngai: Frequently Asked Questions
Is Koh Ngai worth visiting?
Koh Ngai holds a 4.6★ rating from 319 Google reviews, placing it among the highest-rated islands in Koh Lanta.
When is the best time to visit Koh Ngai?
The best months to visit Koh Lanta are November – April, with the most reliable weather. Crowds peak in December – January & European school vacations — going early in the day usually means fewer people. Months to think twice about: May – October (monsoon; many businesses close).
Where is Koh Ngai located?
Koh Ngai is at Ko Lanta Yai, Kantang District, in Koh Lanta. Getting around Koh Lanta: Motorbike rental (฿250–300/day; one main road runs the west coast); Tuk-tuks and songthaews along the beach road.
Also popular in Koh Lanta
Nui Bay
A small sheltered cove on Lanta's west coast, forested hills behind, and far fewer people than the big beaches.
Lanta Elephant Lover by Lanta Elephant Conservation
Ethical elephant sanctuary near Klong Jak Waterfall offering feeding, forest walks, and gentle water care with well-cared-for elephants.
Mama Dang Kitchen
A well-loved Thai kitchen in Koh Lanta serving home-style dishes at mid-range prices, open daily.
Long Beach Chalet
Beachfront resort on Koh Lanta with thatched chalets, an infinity pool, and a relaxed tropical atmosphere.
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