Similan Islands, Thailand
    กำหนดพื้นที่เกาะราชาใหญ่ เกาะราชาน้อย ตำบลราไวย์ อำเภอเมืองภูเก็ต จังหวัดภูเก็ต

    Bay 1 / Ao Ter

    Best months: Jan–May

    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 - Bay 1 / Ao Ter offers some of Similan Islands's richest reef diving. Water ranges 29-31°C, warmest April, May, June.

    Best timeJan–May
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBlacktip Reef Sharks, Eagle Rays, Giant Moray Eels, Whale Sharks and Clownfish · 173+ species recorded
    Water29-31°C · warmest April, May, June
    CharacterReef dive
    StandoutExceptional marine biodiversity

    Bay 1, or Ao Ter, on Similan Island No. 1 is one of our favourite spots for a truly relaxed dive. Forget big pelagics and raging currents; this is a place to slow down, settle into the sand, and let the reef come to you. We often drop in and drift gently along the sloping reef, which rarely dips below 20 metres, making it ideal for longer bottom times. The hard corals, particularly the large table and staghorn formations, are a real draw here. We've spent entire dives just hovering over a single coral head, watching the tiny Redfin Triplefins dart about, or trying to spot the ridiculously camouflaged Freckled Anglerfish. They're masters of disguise, so a keen eye and some patience are rewarded. The Ostrich Gobies are abundant, often sharing their burrows with tiny shrimp, and we’ve consistently found groups of Yellowstriped Cardinalfish hovering under ledges. It’s a site that rewards macro enthusiasts and new divers alike – calm conditions and plenty to see without having to fight a current. Our best dives here have been in the morning, right after sunrise; the light catches the reef beautifully and the smaller critters are often more active before the day boats arrive.

    Today06:1418:1411h 59m daylightGolden hour 17:46

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    Conditions

    Ocean conditions, forecast and tides for Bay 1 / Ao Ter

    Bay 1 / Ao Ter Ocean Conditions

    Monthly averages for Bay 1 / Ao Ter, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.1, 98.3) (6km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    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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