Ishigaki & Yaeyama, Japan
    伊良部

    Hanadainone

    Best months: Apr–Jun

    Protected Area

    伊良部

    Why dive here

    With 428+ marine species recorded in the area - including bull sharks, manta rays, mobula rays (devil rays), seahorses and sea turtles - Hanadainone offers some of Ishigaki & Yaeyama's richest diving. Water ranges 23-30°C, warmest July, August, September.

    Best timeApr–Jun
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBull Sharks, Manta Rays, Mobula Rays (Devil Rays), Seahorses and Sea Turtles · 428+ species recorded
    Water23-30°C · warmest July, August, September
    StandoutExceptional marine biodiversity

    Hanadainone is where we go when we want to feel small. This isn't a site for picking out nudibranchs, though you’ll spot a cowry or two if you look closely. It’s all about the sheer scale of the coral bommies, rising like underwater mountains. We’re talking colossal cauliflower and staghorn colonies that have been growing for decades, maybe even centuries. The water here often has a beautiful blue tinge, and when the sun hits those massive coral structures, the whole place just glows. You’ll drift past walls of lesser valley coral and intricate brain corals, with schools of fusiliers sometimes so dense they momentarily block the light. Our favourite part is finding the sheltered pockets where speckled groupers eye you with an air of ancient wisdom. It’s a gentle drift, best suited for divers who appreciate the grandeur of a mature reef and want to experience something truly expansive.

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    Conditions

    Ocean conditions, forecast and tides for Hanadainone

    Hanadainone Ocean Conditions

    Monthly averages for Hanadainone, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (24.6, 124.35) (10km away)

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    October Averages

    Sea Temperature

    29°C

    84°F · Range: 27–30.4°C

    Air Temperature

    26°C

    79°F

    Wind Speed

    7.74 m/s

    15.0 knots

    Atmospheric Pressure

    1013.6 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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