Zakynthos Tour
Keri Caves & Turtle Island Glass-Bottom Boat Cruise
A 3-hour glass-bottom cruise through the National Marine Park — the dramatic Keri sea caves, a swim at Marathonisi 'Turtle Island', and a chance to spot loggerhead turtles.
Highlights
- 3-hour glass-bottom cruise through the National Marine Park
- The stunning Keri sea caves and a swim near Marathonisi Island
- Small group — a maximum of 16 guests
- Depart from Agios Sostis Harbour; life jackets & guidance included
Explore the stunning southern coastline of Zakynthos on a 3-hour glass-bottom boat cruise through the National Marine Park. Starting from Agios Sostis Harbour, you’ll glide across the turquoise water of Laganas Bay — a vital nesting area for loggerhead sea turtles.
Marvel at the Keri Caves, where dramatic white cliffs and natural arches meet the sea, swim near Marathonisi “Turtle Island”, and capture Cameo Island on the way back. With a maximum of just 16 guests, it stays personal and relaxed throughout.
What you’ll see
- 1
Agios Sostis Harbour
Meet the crew, get a short safety briefing and board the glass-bottom boat into Laganas Bay.
- 2
National Marine Park (Laganas Bay)
Cruise the protected bay — the key loggerhead (Caretta caretta) nesting area — looking for turtles.
- 3
Cameo Island
Scenic pass-by of the little island formed after a 17th-century earthquake.
- 4
Marathonisi (Turtle Island)
A swim and relaxation stop at the iconic turtle-shaped island.
- 5
Keri Caves
Explore the impressive sea caves, natural arches and vivid blue water.
- 6
Limni Keri
A final swim in a sheltered, crystal-clear cove (weather permitting).
What's included
- Glass-bottom boat cruise
- Professional captain
- English-speaking tour guide
- Swimming stops
- Safety briefing
- Fuel and local taxes
Not included
- – Hotel pickup & drop-off (just ask)
- – Food & drinks
- – Personal expenses
Frequently asked questions
Will we see turtles?+
Laganas Bay is the Mediterranean's main loggerhead nesting area, so sightings are common in summer — but they're wild, protected animals, so we can never guarantee it.
Where do we meet?+
Agios Sostis Harbour in Laganas, at the pier near the small fishing boats — look for the glass-bottom boat. Please arrive 15 minutes before departure with your mobile voucher.
How big is the group?+
Small and personal — a maximum of 16 guests, so you get real attention from the captain and host.
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Want to join this tour?
Book instantly on Viator with free cancellation, or message us on WhatsApp — we’ll help you pick the perfect day and arrange hotel pickup.