Dive-site story
Koh Haa 1, also known as Koh Haa Nueng, is the northernmost limestone islet in the Koh Haa archipelago within Mu Ko Lanta National Park. Divers visit this site primarily for The Chimney, a vertical swim-through cutting through the island's rock flank with light streaming down from multiple chambers. Outside the cavern system, the limestone wall steps down onto coral ridges and a gentle sandy slope dotted with sea fans and hard coral bommies.
The Chimney, a vertical cavern swim-through with multiple exit portals and schooling glassfish
Sheltered coral slopes supporting macro critters like ghost pipefish and nudibranchs
Regular encounters with banded sea kraits and hawksbill sea turtles feeding along the reef crest
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
The marine national park is officially open for diving from mid-October to mid-May, offering calm seas and peak underwater clarity during the dry northeast monsoon.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Banded sea kraitLaticauda colubrina | Common | ||||||||||||
| Hawksbill sea turtleEretmochelys imbricata | Common | ||||||||||||
| Ornate ghost pipefishSolenostomus paradoxus | Seasonal | ||||||||||||
| Golden sweepersParapriacanthus ransonneti | Common | ||||||||||||
| Whitetip reef sharkTriaenodon obesus | Seasonal |
Marine forecast
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