Alonissos Triton Dive Center operates in Alonissos, in the National Marine Park of Alonissos and Northern Sporades — the first and largest marine park in Europe. Diving is centred on the wreck of Peristera, a 5th-century BC shipwreck considered the oldest accessible wreck in the world, alongside wall dives, reef dives and small caverns. The centre runs daily boat trips from its waterfront shop/dive centre on its own dive boat 'Triton', and teaches the full PADI course range from Bubblemaker and Discover Scuba Diving through Open Water, Advanced, Rescue Diver and specialty courses, as well as PADI Freediver training.