Koh Hey/Coral Bay
Protected Area
กำหนดพื้นที่เกาะราชาใหญ่ เกาะราชาน้อย ตำบลราไวย์ อำเภอเมืองภูเก็ต จังหวัดภูเก็ต
Why dive here
With 173+ marine species recorded in the area - including blacktip reef sharks, eagle rays, giant moray eels, whale sharks and clownfish - Koh Hey/Coral Bay offers some of Similan Islands's richest reef diving. Water ranges 29-31°C, warmest April, May, June.
We often suggest Koh Hey, or Coral Bay as some call it, as a first dive in the Similans. It’s pretty shallow, topping out around 13 metres, making it perfect for getting comfortable again after a break or for newer divers. The reef here is mostly hard coral formations, with a good chance of spotting reef sharks cruising over the sand patches. We’ve seen plenty of blue-spotted rays tucked under ledges and often find cuttlefish changing colours right before our eyes. Visibility is usually decent, and the currents are typically mild, making it a calm start to a Similan trip.
Typical Koh Hey/Coral Bay Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Always perform a 3-minute safety stop at 5m before surfacing.
Nearest Dive Centres to Koh Hey/Coral Bay
Dive shops near Koh Hey/Coral Bay
Aquasub
Aum Scuba
Tommy’s Dive Center Phuket
Scuba Nicks
Amazing Phuket adventures
Local Dive Thailand
Reviews for Koh Hey/Coral Bay
Conditions
Ocean conditions, forecast and tides for Koh Hey/Coral Bay
Koh Hey/Coral Bay Ocean Conditions
Monthly averages for Koh Hey/Coral Bay, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.1, 98.3) (6km away)
October Averages
Sea Temperature
30°C
85°F · Range: 28.7–30.4°C
Current Speed
5.1 cm/s
Direction: S (191.3°)
Salinity
29.75 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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