- Open Water course
- €450
- Water temperature
- 15–26°C
Updated July 2026
Good to know
Good to Know
- This is genuinely a day-boat diving destination, not a liveaboard one — nearly all sites are reachable within 10-30 minutes by boat from harbors around Keri, Limni Keriou, Laganas or Agios Sostis.
- Dive strongly in season: outside late May–September the water gets cold (down to ~15°C in February) and marine life sightings drop off noticeably, even though visibility can still be excellent.
- Sea turtle and Mediterranean monk seal sightings around Marathonisi and Keri are common but not guaranteed — they're wild, wide-ranging animals, and several visiting divers report missing them even in high season.
- If you want cave/cavern sites like Keri Caves, Four Caves, or the Cave Tunnel, having an Advanced Open Water certification (and ideally a cave/cavern specialty) is genuinely useful, not just a nice-to-have, given the swim-throughs and enclosed spaces involved.
- Don't mix up the northern 'Blue Caves' near Cape Skinari (a boat-tour/snorkel spot) with the southern Keri cave-and-cavern dive sites — they're on opposite sides of the island.
- Course and trial-dive prices vary noticeably by operator and by booking channel — booking direct with the dive shop is sometimes cheaper than through third-party activity marketplaces.
- Most dive centers operate seasonally, roughly May to October, in line with tourist season and calmer sea conditions; don't expect year-round operation.
- If freediving specifically (not just scuba) is your goal, look specifically for the dedicated freediving/snorkeling club or the one PADI center advertising a PADI Freediving course, rather than assuming any random dive shop offers it.
Dive Sites And Conditions
- Regional Stats
- According to PADI's dive site database, Zakynthos has around 25 listed named dive sites, the large majority classed as reef and wall dives, with a smaller number of sandy-bottom sites.
- Overall Accessibility
- Diving around Zakynthos is predominantly short day-boat diving, not liveaboard-dependent. Most dive centers are clustered in the south of the island (Keri, Limni Keriou, Laganas, Agios Sostis) and run daily boat trips of roughly 10-30 minutes to reach the site clusters. There is no established liveaboard scene here — this is a shore-town-based, day-boat destination.
- Site Hub Note
- The highest concentration of dive shops and dive sites is around the Keri Peninsula in the south, near the Zakynthos National Marine Park.
Sites
Keri Caves (Blue Caves of Keri)
- Type
- Cave / Wall / Reef
- Depth
- Average depth ~18m, deepest sections over 40m; one large cavern reaches roughly 75m in length
- Location
- Keri Peninsula, southern coast
- Best Season
- Late May–September
- Marine Life And Features
- A dive through a deep cave system, reef walls, tunnels and caverns, including a huge blue cavern; divers ascend at the end through a cave with a freshwater layer near the exit, and bats are sometimes seen roosting in the caves.
- Notes
- One of the island's most iconic and frequently dived sites; suitable for divers with cave/cavern comfort, though guided tours make it accessible to certified recreational divers.
Barakuda (Barracuda Reef/Caves)
- Type
- Wall / Reef
- Depth
- First reef wall ends around 18m; a second wall continues down beyond 50m
- Location
- Keri Peninsula area
- Best Season
- Late May–September
- Marine Life And Features
- Known for hosting some of the largest marine life on the island's dive circuit, including predatory pelagic fish like bluefin tuna in the deeper second wall.
- Notes
- Deeper sections suit more advanced/experienced divers.
Marathonisi Island (Turtle Island)
- Type
- Reef
- Depth
- Average depth ~10m, maximum around 20m
- Location
- Keri Peninsula / Laganas Bay, part of the Zakynthos National Marine Park
- Best Season
- May–October (loggerhead turtle nesting/activity period)
- Marine Life And Features
- Famous for resident loggerhead sea turtles, plus octopus, cuttlefish, moray eels, lionfish, wrasse, and large schools of tuna or amberjack around the limestone reef.
- Notes
- One of the most popular and beginner-friendly sites — shallow depth and generally calm conditions with almost no current.
Marathia
- Type
- Wall / Reef
- Depth
- Shallow entry descending to a steep wall/drop-off with deep pockets
- Location
- Keri Peninsula, along the limestone cliffs
- Best Season
- Late May–September
- Marine Life And Features
- Octopus-rich rocky slope leading to a wall with deep pockets, lobsters and cuttlefish ('flapjacks'), with occasional sightings of the endangered Mediterranean monk seal, which is known to frequent the Keri area.
- Notes
- Monk seal sightings are opportunistic, not guaranteed.
Oktopus
- Type
- Reef / Cave
- Depth
- Limestone walls down to about 30m, with a cave around 15m deep
- Location
- Keri Peninsula
- Best Season
- Late May–September
- Marine Life And Features
- Dramatic boulder formations that divers weave through; grouper, moray eels, lobsters, eels and octopus hide in crevices, and remnants of ancient amphora pots have been spotted in the reef.
- Notes
- Terrain is more maze-like and disorienting — a torch and good buoyancy control help.
Lakka (The Arch / Arc De Triomphe)
- Type
- Reef / Wall / Cavern
- Depth
- Average depth ~18m, maximum reported around 70m; the arch feature itself spans roughly 8m to 20m
- Location
- Keri Peninsula
- Best Season
- Late May–September
- Marine Life And Features
- Centered on a natural rock arch formation; walls are encrusted with soft corals, sponges and colorful nudibranchs, with numerous swim-throughs where Spanish/slipper lobsters can be found, plus combers, damselfish, sea bream, blennies, wrasse and parrotfish.
- Notes
- Popular for underwater photography due to the arch and macro life; often cited by repeat visitors as a personal favorite for combining caves with photogenic critters.
Dafni
- Type
- Reef (shallow)
- Depth
- Shallow, suitable for all levels
- Location
- Keri Peninsula area
- Best Season
- Late May–September
- Marine Life And Features
- Rock formations riddled with octopus and scorpion fish.
- Notes
- Good option for beginners or as a second, easier dive of the day.
Alati
- Type
- Wall
- Depth
- Deep walls running down to around 30m
- Location
- Keri Peninsula area
- Best Season
- Late May–September
- Marine Life And Features
- Wall-life typical of the area's reef fish and invertebrates (specific highlights not well documented beyond the wall structure itself).
- Notes
- Less written about than the marquee sites; typically included in multi-site boat itineraries.
Four Caves
- Type
- Cave / Cavern
- Depth
- Maximum around 35m
- Location
- Keri coastline
- Best Season
- Late May–September
- Marine Life And Features
- Four adjacent caverns explorable in a single dive; Mediterranean monk seals have reportedly been spotted resting in the caverns.
- Notes
- Recommended for divers with cavern/advanced training given the depth and enclosed spaces.
Cave Tunnel
- Type
- Cavern
- Depth
- Not specifically documented
- Location
- Keri coastline
- Best Season
- Late May–September
- Marine Life And Features
- Features a cavern with two distinct chambers, an upper and a lower one.
- Notes
- A cave/cavern specialty or advanced open water background is recommended for this type of site.
Poseidon Cave
- Type
- Cave
- Depth
- Not well documented
- Location
- Keri coastline
- Best Season
- Late May–September
- Marine Life And Features
- Named as part of the local Keri dive-site roster; specific marine life details are not well documented in available sources.
- Notes
- Listed by local dive operators as part of the standard site rotation.
Elefant (Elephant Rock)
- Type
- Reef / Rock formation
- Depth
- Associated wall runs roughly 12m to 30m
- Location
- Near Lakka, Keri Peninsula
- Best Season
- Late May–September
- Marine Life And Features
- Named for an elephant-head-shaped rock breaking the surface; part of the same wall system as Lakka/The Arch.
- Notes
- Often dived in combination with the neighboring Lakka site.
Faros
- Type
- Reef
- Depth
- Not well documented
- Location
- Keri coastline (near a lighthouse point)
- Best Season
- Late May–September
- Marine Life And Features
- Listed among the named Keri-area sites by local dive centers; detailed marine life descriptions were not found in available sources.
- Notes
- Included here for completeness, but details are thin — worth confirming directly with a local dive shop before booking specifically for this site.
MV Terekhol Shipwreck
- Type
- Wreck
- Depth
- Advanced-level depth (exact figure not consistently reported)
- Location
- Off the Zakynthos coast
- Best Season
- Late May–September
- Marine Life And Features
- A Russian cargo ship that sank off Zakynthos in 2008; the wreck's cargo of cars and trucks is still visible, and the structure has since become a marine-life habitat.
- Notes
- This is described as suited to advanced divers rather than a beginner site.
Porto Limnionas
- Type
- Reef (sheltered bay)
- Depth
- Shallow, bay-sheltered
- Location
- Western coast of Zakynthos
- Best Season
- Late May–September
- Marine Life And Features
- Crystal-clear, calm bay where turtles and other marine life can be seen; sheltered from strong currents, making it approachable for beginners.
- Notes
- Better characterized as a beginner/snorkel-friendly bay than a dramatic technical dive.
Blue Caves (Cape Skinari, North Coast)
- Type
- Sea caves
- Depth
- Shallow, tourist-boat/snorkel depth
- Location
- Northern coast of Zakynthos, near Cape Skinari
- Best Season
- May–September
- Marine Life And Features
- A series of natural sea caves with striking blue-lit water; fish species, sponges and soft corals are visible in the caverns.
- Notes
- Important distinction: this northern 'Blue Caves' at Cape Skinari is primarily a glass-bottom-boat and snorkeling tourist attraction, not a core scuba dive-boat destination — it is geographically separate from the southern 'Keri Caves,' which locals and some operators also loosely call 'blue caves' due to the water color. Don't confuse the two when booking.
Season
- Peak Season
- Late May to late September/end of September is consistently cited as the high diving season, when the Ionian Sea warms up and marine life is most active.
- Water Temperature
- Water temperature swings from around 15°C in February (the coldest month) up to roughly 26°C in August (the warmest).
- Off Season Note
- Diving outside the May–September window is possible for experienced divers with proper thermal protection (7mm wetsuit, hood, gloves recommended), but the water is notably cold and marine life sightings are less common.
Typical Course And Dive Costs
Discover Scuba Diving / Try Dive (No Certification, 1 Guided Dive)
- Price
- €70
- Notes
- Entry point price seen; some listings for a fuller half-day trial with boat trip run higher, around 130 EUR (~140 USD).
PADI/SSI Open Water Diver Certification Course
- Price
- €450
- Notes
- Prices across operators range roughly 450–500 EUR; typically includes theory sessions, a pool dive, and 4 open-water dives.
Single Fun Dive for Already-certified Divers (Boat, Full Equipment)
- Price
- €60
- Notes
- One operator's tiered pricing drops with volume, e.g. down to about 48 EUR (~52 USD) per dive for 10+ dives; another source cites an average of roughly 40 EUR (~43 USD) per dive.
Operator Density
- Estimate
- At least 9 distinctly named dive operators identified across the island, indicating a genuinely dense scene for an island this size, concentrated mainly around Laganas, Tsilivi, Keri/Limni Keriou, and Porto Limnionas.
Named Operators Found
- Eurodivers Zante (Laganas) — PADI 5 Star Dive Resort, courses from Open Water to Divemaster
- Zante Diving (zantediving.gr) — PADI 5 Star center, daily boat trips to Keri Caves & Turtle Island, also lists PADI Freediving and PADI TecRec
- Diver's Paradise Zakynthos (Laganas)
- Zante Blue Reef Divers (Tsilivi) — SSI center, courses from Open Water to Divemaster
- SUB AQUA DiveCenter — SSI and CMAS courses offered
- Islanders Zante Diving Center (Porto Limnionas, with Laganas pickup/shuttle) — PADI and SSI
- Dive Center Turtle Beach (Limni Keriou) — instructors reported with 20–35 years experience
- St. Nicholas Beach Watersports Zakynthos
- Reef Freediving & Snorkeling Club — dedicated freediving/snorkeling operator
Certification Levels Available
Entry-level 'Discover Scuba Diving' / Try Dive intro programs (no certification) are near-universal. Full certification tracks commonly run from Open Water Diver up through Divemaster; at least two operators explicitly advertise the full PADI ladder up to Divemaster, and one PADI center also lists PADI TecRec (technical diving) alongside standard recreational levels.
Certifying Bodies Commonly Offered
Certifying Bodies Commonly Offered
- PADI (most common — several PADI 5 Star Dive Resorts/Centers on the island)
- SSI (offered at multiple centers, sometimes alongside PADI)
- CMAS (offered at one identified center in addition to SSI)
Freediving Crossover
Genuine crossover exists but is limited to specific operators rather than being island-wide. One PADI 5-star center (Zante Diving) explicitly lists PADI Freediving as a course alongside its scuba offerings. Separately, a dedicated Reef Freediving & Snorkeling Club operates on the island as a freediving/snorkeling-focused business rather than a scuba shop, and at least one visitor inquiry referenced completing an SSI freediving course tied to that club. Several other scuba-focused shops use SSI as their certifying body, and SSI's own certification scope includes freediving programs, but explicit evidence of those particular shops actively running freediving courses (beyond scuba) was not found — so freediving crossover should be described as present at a couple of specific operators, not as a general island-wide pattern.
AI-generated estimateData refreshed July 2026
This section has no cited sources.
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Data last updated July 2026 · Verify anything important.