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Scuba diving at Two Brothers (Adelfoi Islets) in Alonissos
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Two Brothers (Adelfoi Islets)

GREAT
AlonissosBoat
About This Site
Two Brothers is a boat-only wall dive on the Adelfoi (Adelfi) islets, two uninhabited rocky islands roughly 10 km ESE of Alonissos inside the Northern Sporades Marine Park. Widely regarded as the largest and most dramatic wall dive in the area, it offers vertical underwater cliffs that drop steeply into clear blue water, a shallow swim-through near the islet, and a small wooden caique wreck resting at around 22 m. The big topography and open-water position draw larger pelagic fish, making it a classic boat-trip pairing of deep wall dives in excellent visibility.

Difficulty

Intermediate

Max Depth

50m

Type

Boat

Typical Visibility

24m

Conditions Summary

Best time today

9AM - 3PM

GREAT

Best day in forecast

Friday

GREAT

2026-07-10

Community-reported visibility

n/a

Warnings for today

None

The dive sits in the channel between Megalo and Mikro Adelfi, roughly 10 km ESE of Alonissos in open Aegean water. From this pin the summer Meltemi and the whole N-to-E arc are blocked by Mikro Adelfi and the bulk of Alonissos and Peristera to the north and northeast, while Megalo Adelfi and the Alonissos landmass shut down the SW-W-NW sectors. The one open swell window faces ESE through SSE - peaking to the SE, consistent with the wall's orientation - and takes easterly-to-scirocco fetch, with only the ESE partly shadowed by distant Skantzoura some 12 km off. Conditions are wind-driven at this microtidal Mediterranean site, and the limiting factor is the exposed open-water crossing, which is cancelled when the Meltemi blows hard even though the channel itself lies in its lee.

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