As of Jun 19, 2026, 8:54 PM, out of season, returns ~November. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Off Thailand's Andaman coast, the warm, plankton-rich water around the Krabi and Trang islands can light up at night.
Bioluminescent dinoflagellates — single-celled plankton, the blue-glowing 'sea sparkle' type — flash a brief cold-blue light whenever the water around them is disturbed.
Drag a hand, kick a fin, or watch a wave break against a longtail's hull and the sea answers in streaks and sparks of blue.
It is faint, so it shows only on genuinely dark nights well after dusk, away from boat and resort lights, and it is strongest when there are enough plankton in the water to make the flash dense.
Night snorkel and longtail tours run from the Ao Nang / Railay / Krabi beaches, while the clear offshore reefs of Ko Haa and Ko Rok deliver it on overnight and camping trips.
The glow is not guaranteed on any single night — it follows the plankton, the darkness, and calm, clear dry-season seas.
Where to see it
A taste of where to see it. The full map, exact coordinates and the best timing for each spot live in the app.
| Viewing spots |
|---|
| Ao Nang / Railay Night-Snorkel Departure (Krabi) |
| Ko Haa (Mu Ko Lanta National Park) |
| + 2 more spots, with exact coordinates and timing, in the app → |
This is the short version
This page shows a taste. The app has the full list of where to see this, the exact timing, and live conditions for 1,000+ natural phenomena worldwide, so you know the moment one is genuinely worth the trip.