Northern Sporades dive sites

Monk seal sightings are possible but rare and should never be expected. The park protects one of the largest remaining populations of this critically endangered species, estimated at around 50 to 80 individuals. The seals use sea caves for resting and pupping, and some dive sites are near known habitat areas. Strict regulations prohibit approaching or disturbing the seals, and certain zones of the park are completely off-limits to protect them.

Diving is permitted only in designated zones and must be arranged through authorised dive centres based in Alonissos. Zone A, the core protection area around Piperi island, is closed to all visitors. Zone B allows limited activities with permits, and the peripheral zones are open for regulated diving. Anchoring on seagrass beds is prohibited, and all divers must follow a strict no-touch, no-take policy. Spearfishing is completely banned throughout the park.

The diving season runs from May to October, with peak conditions from June through September when water temperatures reach 22 to 26 degrees Celsius and visibility regularly exceeds 25 metres. July and August can be windy due to the Meltemi winds, which may limit boat access to certain sites on exposed days. Early summer and September often provide the best combination of warm water, good visibility, and calmer wind conditions.