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Scuba diving at The Chimney (Agios Georgios) in Alonissos
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The Chimney (Agios Georgios)

GREAT
AlonissosBoat
About This Site
The Chimney is the standout topography dive on Agios Georgios, the small islet sitting in the channel between Alonissos and Skopelos inside Europe's largest marine protected area, the National Marine Park of Alonissos and the Northern Sporades. Off the islet's south side a reef built of two large pinnacles rises toward the surface, and its signature feature is a near-vertical chimney: divers drop through a hole in the rock at around 14 m and descend inside a natural shaft that opens into a small cavern glowing with orange sunset-cup coral before exiting into the blue at roughly 22 m. Add walls draped in life, a maze of small pinnacles, and a shallow reef swarming with nudibranchs for the safety stop, and it becomes the area's most memorable structure dive. Good buoyancy and comfortable finning are needed for the swim-through and any current, making it a rewarding intermediate-level dive rather than a beginner site.

Difficulty

Intermediate

Max Depth

29m

Type

Boat

Typical Visibility

20m

Conditions Summary

Best time today

8AM - 2PM

GREAT

Best day in forecast

Friday

GREAT

2026-07-10

Community-reported visibility

n/a

Warnings for today

None

The site sits on the SOUTH side of Agios Georgios islet in the Alonissos-Skopelos channel, with the islet's own bulk immediately to the north shielding it from the dominant summer Meltemi that blows from the N-NW; this northern shadow, reinforced by the Skopelos landmass to the west and southwest, is what keeps the south side workable through much of the windy season. The exposed window is the channel itself: swell and wind-sea funnelling up from the S-SSE-SE and the open S sector reach the site most directly, so a southerly blow or wind against the channel axis is what builds surface chop and current here. Westerly and northerly weather is largely blocked by the surrounding islands, making the south side of the islet the reliable lee for most conditions but the exposed face when the wind swings south.

NNEESESSWWNW
Protected
Partially Exposed
Exposed
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Nearby Dive Sites
Blue CavePeristera Ancient WreckMourtias Reef (North & South)Agios Georgios Gorgonian GardenTwo Brothers (Adelfoi Islets)Two Brothers' Shipwreck