Glide past limestone cliffs on a glass-bottom boat to watch loggerhead turtles, swim in emerald caves, and relax on Marathonisi’s private sandbar. This short, three-hour cruise pairs easy snorkeling with responsible wildlife viewing in the National Marine Park.
More ways to explore the area's outdoor wonders
The boat slips away from Agios Sostis and the island exhales salt and sun. A glass panel beneath the cabin floor reveals slow-moving shapes — loggerhead turtles drifting like slow moons beneath the surface — while the bow cuts toward the Keri cliffs. Waters here push and pull with the Ionian current; caves open like doors to startling blue chambers, and Marathonisi’s sandy rim offers a sheltered bay where sea turtles come to nest.
Difficulty
easy
Duration
3 hours
Fitness Level
Basic mobility is sufficient; participants should be comfortable boarding small boats and swimming short distances.
Wildlife
History
Zakynthos’ southern coast formed from marine limestone and has long been a fishing and seafaring zone; the National Marine Park was established to protect important turtle nesting beaches.
Conservation
Operators follow National Marine Park guidelines—avoid single‑use plastics, keep distance from wildlife, and support local efforts that monitor nesting sites.
Reserve your spot on the Zakynthos: Glass Bottom Turtle Boat Tour to Keri Caves & Islands today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Protect sea life
Do not touch or chase turtles; maintain distance and follow guide instructions to avoid disrupting nesting or feeding behavior.
Bring reef‑safe sunscreen
Chemical sunscreens harm marine life—use biodegradable alternatives and reapply sparingly before entering the water.
Stability on deck
Wear non‑slip water shoes and brace for boat movement when snorkeling or boarding—surfaces can be wet and uneven.
Timing matters
Morning departures usually have calmer seas and clearer underwater visibility; mid‑day is hotter and busier.
Snorkel mask and fins
Personal gear gives better fit and comfort while exploring caves and reefs during swim stops.
summer
Reef‑safe sunscreen
Protects skin and the marine environment during prolonged sun exposure on deck and in the water.
summer
Water shoes
Provide grip on wet steps and rocky shorelines for quick beach entries at Marathonisi.
summer
Light windbreaker or rash guard
Shields from spray and wind during cooler mornings or breezy afternoons.
spring