Marathonisi (Turtle Island), Zakynthos: Nature's Sanctuary in the Ionian Sea
Floating in the calm, clear waters of Laganas Bay, Marathonisi—widely known as Turtle Island—is one of Zakynthos' most distinctive natural landmarks. Viewed from a distance, the island’s sloping shape resembles the shell of a sea turtle, a fitting symbol given that it also serves as a key nesting site for the endangered loggerhead turtle (Caretta caretta). Uninhabited, protected, and raw in its beauty, Marathonisi is not just a beach destination—it’s a glimpse into the wilder side of the island.
A Protected Paradise
Marathonisi forms part of the Zakynthos Marine Park, a protected area established to safeguard the nesting grounds of sea turtles and the integrity of the island’s ecosystems. Landing on the island feels like stepping back in time. There are no shops, no buildings, and no noise beyond the sea lapping against the shore and the calls of distant birds. Visitors are asked to tread lightly—literally and figuratively—as the sandy beach is a crucial nesting site during turtle season, which runs from May to October.
The Beaches of Turtle Island
Marathonisi actually has two distinct beaches. One is a long stretch of fine, pale sand where turtle nests are often roped off for protection. Access is permitted, but with strict rules: no sunbeds, no umbrellas, no digging or loud music, and visitors must stay clear of marked nests. The second side of the island features a rocky shoreline with sea caves nearby, ideal for snorkeling and exploring by kayak or paddleboard.
Because the island is small and uninhabited, it’s essential to bring everything you might need with you—drinking water, snacks, and sun protection are non-negotiable. There are no facilities, which helps preserve the island’s untouched character.
Best Time to Visit
The best time to visit Marathonisi is in the morning before the midday heat sets in and before the majority of boat tours arrive. Sea turtles are most active around sunrise and sunset, and early visits offer the best chance of spotting them swimming near the boat or coming up for air. While the island is accessible throughout the day, it can become quite busy in high summer months, particularly July and August.
Spring and early autumn are especially pleasant for those who prefer a quieter, more nature-focused experience, though turtle sightings become less frequent as nesting season winds down.
Activities Around Marathonisi
Though limited in infrastructure, Marathonisi offers a few key activities that make the visit memorable:
Swimming and snorkeling: The waters around the island are famously clear, with excellent visibility. The rocky shoreline to the west features small sea caves where snorkelers can observe fish and marine life in their natural habitat.
Boat excursions: Most visitors arrive by boat, either through organized tours or private rentals. Some trips include glass-bottom boats or guided eco-tours that explain the importance of the marine park and its wildlife.
Kayaking or SUP: For the more adventurous, paddling from Agios Sostis or Keri Beach offers a more immersive way to reach the island and explore the surrounding coastline.
Turtle spotting: While the island itself is a nesting ground, turtles are more often spotted swimming in the bay. Responsible tour operators avoid crowding them and follow marine park guidelines to protect their behavior.
Visitor Tips
Marathonisi is a wild, undeveloped environment, so preparation is key. Bring water, snacks, and sunblock, and plan to take any rubbish back with you. Visitors are expected to respect conservation rules, especially in turtle nesting zones—avoid digging, don’t touch the turtles or nests, and follow designated landing areas for boats.
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