South Coast · Glass Bottom Boat

National Marine Park
Zakynthos

Three hours through the heart of South Zakynthos. Two swimming stops, a glass bottom section for underwater viewing, Marathia thermal springs, sea caves, and some of the best turtle sightings on the island.

Overview

Tour Details

Duration
3 hours
Price
€25/person
Departures
09:00 · 12:00 · 15:00
Departure Point
Agios Sostis harbour
Vessel
Glass bottom boat, up to 45 people
Itinerary

The Route

  1. 1. Turtle Spotting — Laganas Bay — Slow cruise through Laganas Bay, primary nesting area of the Caretta-caretta loggerhead turtle. The glass bottom section allows underwater viewing as the boat moves. Morning departures offer the highest chance of surface sightings.
A Caretta-caretta sea turtle surfacing in Laganas Bay, Zakynthos
Caretta-caretta sea turtles in Laganas Bay
  1. 2. Marathia — Thermal Springs · 1st Swimming Stop — Natural sulphurous thermal springs rise through the seabed, creating warm, mineral-rich water with documented therapeutic properties. One of the most unusual swimming experiences on the island.
Self-drive boat at the Marathia thermal springs, South Zakynthos
Marathia thermal springs — first swimming stop
  1. 3. Keri Caves — First Arch — Limestone cave system carved into the cliff line. Turquoise water inside the arch. The boat passes through for viewing — a stunning introduction to the Keri Cave network.
Boat entering the first arch of the Keri Caves, Zakynthos
Keri Caves — first arch passage
  1. 4. Marathonisi — Turtle Island · 2nd Swimming Stop — Small uninhabited island at the centre of the Marine Park. Shallow, sheltered, consistently among the clearest water on the south coast. Turtles frequently surface here.
Boat anchored at Marathonisi Turtle Island, Zakynthos Marine Park
Marathonisi (Turtle Island) — second swimming stop
Questions

Frequently Asked Questions

Will we definitely see turtles?

Common but not guaranteed — wild animals in their natural habitat. The 09:00 departure gives the highest likelihood of sightings.

What are the thermal springs at Marathia?

Natural sulphurous springs rising through the seabed. The water is warmer than the surrounding sea and rich in minerals with therapeutic properties.

Is this tour suitable for children?

Yes. Calm, sheltered waters. The glass bottom section is particularly popular with children. No minimum age.

Getting There

Meeting Point

Departures from Agios Sostis harbour, South Zakynthos.

From Kalamaki / Airport: ~5 min by car · From Laganas: ~10 min
From Zakynthos Town: ~15 min · From Tsilivi: ~20 min

Need a lift?

Contact us when booking and we will arrange it. Transfer charged separately.

Our Office

You can also visit us at our office opposite Zakynthos Airport in Kalamaki and book in person any time. We're open daily during the tourist season and happy to help you plan your trip face to face.

How to Book

Ready to Explore?

Tell us your preferred date and number of guests. We confirm availability and respond directly.

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