Glass‑bottom encounters: a three‑hour chase of Caretta‑caretta, Marathonissi’s white sand and Keri’s sea caves

LAGANAS BOAT TOUR FIELD GUIDE

Glass‑bottom encounters: a three‑hour chase of Caretta‑caretta, Marathonissi’s white sand and Keri’s sea caves

A three‑hour cruise from Laganas that pairs guaranteed turtle sightings from a glass‑bottom boat with a swim at Marathonissi (Turtle Island) and exploration of the Keri Caves — this guide explains what to expect and how the outing flows.

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Glass‑bottom encounters: a three‑hour chase of Caretta‑caretta, Marathonissi’s white sand and Keri’s sea caves.

Duration
3 hours
Location
Laganas
Operator
Zante Turtle Tours
Category
Boat Tour
Robert Eric Crews
Founder & Editor, The Adventure Collective
Published Verified

Set off from Laganas aboard a comfortable glass‑bottom boat to search for the island’s emblematic Caretta‑caretta. In three hours you’ll pass Zakynthos’ jagged coastline, pause for an extended swim at Marathonissi’s white‑sand shore, and slip into the clear water of the Keri Caves — all staged by experienced captains who know where the turtles frequent.

Highlights

Outing Highlights

THE WILDLIFE

Guaranteed Caretta‑caretta sightings from a glass‑bottom boat

The tour centers on spotting Caretta‑caretta in their natural habitat using the boat’s glass viewing panels; the operator offers a 100% turtle‑sighting guarantee.

THE SWIM

Marathonissi (Turtle Island): a long swim on white sand

One of the tour’s primary stops is Marathonissi — the small, turtle‑shaped island known as Turtle Island — where the cruise includes approximately one hour of swimming at its white‑sand beach.

THE COASTLINE

Keri Caves and cinematic photo stops

The itinerary also takes you along Zakynthos’ dramatic coastline to the Keri Caves, with opportunities to swim in crystal‑clear waters and make multiple photo stops throughout the cruise.

What the day feels like

How the three‑hour outing feels

This is a compact, coastal reconnaissance: a comfortable boarding, short runs along the shore interrupted by glass‑bottom viewing, a leisurely swim stop at Marathonissi of roughly an hour, then a stop to explore and photograph the Keri Caves before returning to Laganas — all paced to maximize sightings and water time.

Suitability

Who it's for

Who gets the most from this short coastal cruise.

1
Families with childrenSuitable for all ages and designed as a short, accessible outing that includes swimming and wildlife viewing.
2
Wildlife seekersIdeal for travelers focused on marine life — the trip’s primary purpose is turtle spotting with a sighting guarantee.
3
Casual swimmersA good match for swimmers who want a single, relaxed swim of about an hour at Marathonissi plus shorter swims at sea caves.
4
Photography enthusiastsOffers multiple photo stops along dramatic coastline and in sea caves; glass‑bottom viewing adds another visual angle.

Practical planner

Details to review before reserving

What to expect

This three‑hour outing includes two swimming stops and multiple photo opportunities; plan for time in the water and boat transfers between stops.

Onboard experience

The vessel has glass‑bottom viewing sections for observing turtles while underway; the captain directs the route to prioritize sightings and swim stops.

Booking Notice

Review cancellation policies before reserving.

Frequently asked questions

Planning Your Outing

How long is the tour?

The cruise lasts three hours.

Will I see turtles?

The operator offers a 100% turtle‑sighting guarantee for the tour.

How much swimming is included?

The tour includes two swimming stops, with approximately one hour of swimming at Marathonissi (Turtle Island).

What landmarks are visited?

Stops include Marathonissi (Turtle Island) and the Keri Caves along Zakynthos’ coastline.

What type of boat is used?

The outing uses a glass‑bottom boat to allow underwater viewing during the cruise.

Where does the tour depart from?

The tour departs from Laganas.