Medes Islands, Spain

    Exsurgence de Port-Miou

    Best months: Jun–Sep

    Why dive here

    With 77+ marine species recorded in the area - including blue sharks, dolphins, ocean sunfish (mola mola), octopuses and sea turtles - Exsurgence de Port-Miou offers some of Medes Islands's richest cave diving. Water ranges 14-24°C, warmest July, August, September.

    Best timeJun–Sep
    WetsuitA 3mm full wetsuit
    Marine lifeBlue Sharks, Dolphins, Ocean Sunfish (Mola Mola), Octopuses and Sea Turtles · 77+ species recorded
    Water14-24°C · warmest July, August, September
    CharacterCave dive
    StandoutRich in charismatic marine life

    Exsurgence de Port-Miou feels less like a dive site and more like stepping into a secret, geological whisper. It's a proper cave dive, so definitely one for those with the right training and a healthy respect for overhead environments. The entrance itself is a thrill, a narrow slit in the rock that opens into a dark, echoing chamber. We love the feeling of the freshwater mixing with the salt, creating a visible thermocline that shimmers like heat haze underwater. It’s an unusual sensation, both visually and physically, and something you really only get in these types of coastal caves. Keep your eyes peeled for the subtle life that thrives in the low light – those Bushy Corals are particularly striking against the rock. We've often seen conger eels tucked into crevices, and sometimes even the odd dogfish hanging out near the mouth. It’s a site that rewards slow, deliberate diving, allowing your eyes to adjust and pick out the details in the shadows. The visibility here can vary, but generally, when it's good, the shaft of light from the entrance is truly something to behold. It’s a dive that sticks with you, a truly unique Medes experience away from the usual reef explorations.

    Safety Notes

    Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.

    Today05:4717:0411h 17m daylightGolden hour 16:25

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    Conditions

    Ocean conditions, forecast and tides for Exsurgence de Port-Miou

    Exsurgence de Port-Miou Ocean Conditions

    Monthly averages for Exsurgence de Port-Miou, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (43.2, 5.22) (37km away)

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    October Averages

    Sea Temperature

    20°C

    69°F · Range: 17.4–22.8°C

    Current Speed

    9.85 cm/s

    Direction: SW (246°)

    Chlorophyll-a

    0.182 mg/m³

    Clear water

    Salinity

    38.21 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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