Agios Sostis: Marathonissi, Keri Caves, and Turtle Spotting

Set sail from Agios Sostis harbor in Laganas, Zakynthos, and immerse yourself in the wonders of the National Marine Park on a glass-bottom boat tour. This adventure offers a unique chance to witness the island’s vibrant marine life and stunning coastal scenery from above and below the waterline.

Relax on board with the choice of shaded seating or stretch out on the sundeck as the boat glides toward the protected waters. The journey takes you to the mesmerizing Keri Caves, where you can swim in crystal-clear waters and watch sunlight dance across the limestone walls, creating a magical blue glow.

The tour continues to Marathonisi, a lush island surrounded by pine, olive, and green oak forests. Here, you’ll spot the famous Caretta Caretta loggerhead turtles, which nest on the island’s sandy beach. Enjoy some free time to explore or unwind at the local bar with snacks and refreshments available for purchase.

While on Marathonisi, keep in mind that only a small section of the beach is accessible due to its status as a turtle breeding ground. Swimming inside the caves is not permitted, but you’ll have ample opportunity to enjoy the turquoise waters nearby and soak up the island’s natural beauty.

After a memorable three-hour journey, return to your starting point in Laganas with unforgettable memories of Zakynthos’ marine treasures. Don’t miss your chance to experience this unique island adventure—check availability and book your spot today!