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North Point（also known as Triple Arches）is the northernmost dive site in the Similan Islands, located ~50 m off the north shore of Koh Ba‑Ngu (Island No. 9) in the Andaman Sea. It’s a legendary advanced drift dive, famous for massive granite boulders, dramatic swim‑throughs, and high chances of pelagic sightings.
Depth: 8–35 m (boulders start at 8 m; sand bottom at 30–35 m; pinnacle to 40 m)
Current: Moderate to strong (Advanced only; strongest at full/new moon)
Visibility: 15–40 m (best: Dec–A…
North Point（also known as Triple Arches）is the northernmost dive site in the Similan Islands, located ~50 m off the north shore of Koh Ba‑Ngu (Island No. 9) in the Andaman Sea. It’s a legendary advanced drift dive, famous for massive granite boulders, dramatic swim‑throughs, and high chances of pelagic sightings.
Depth: 8–35 m (boulders start at 8 m; sand bottom at 30–35 m; pinnacle to 40 m)
Current: Moderate to strong (Advanced only; strongest at full/new moon)
Visibility: 15–40 m (best: Dec–Apr)
Water Temp: 26–29°C
Best Season: Oct–May (Similan open; closed Jun–Sep monsoon)
Type: Giant granite boulders, arches, swim‑throughs, canyons, sand patches
A cluster of huge submerged granite boulders extends north from the island, forming a maze of tall walls, deep channels, and three iconic arches (hence “Triple Arches”). Smooth rock surfaces are carpeted with vibrant soft corals, sea fans, and crinoids, while sand bottoms lie between boulder groups.
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