Glaronissia (Seagull Islands)
Glaronissia are the small islets off Milos's north coast with hexagonal basalt columns rising from the sea floor. Wannadive lists the site at an average of 20 m and a maximum of 26 m (open-water level); TripBase mentions good visibility and Mediterranean fish such as sea bream, damselfish and barracuda.
depth: None–26 m