The columnar basalts are massive basaltic formations whose show in the territory a submarine eruptive activity or the presence of old volcanoes now gone. Other kind of columnar basalts can be admired:
-- In the gorges of Alcantara
-- To Antrim in the Northern Ireland, where they have originated the famous " Pavement of the Giants "
-- To the island of Staffa, in Scotland, inside the cove of Fingal.
-- To Motta S. Anastasia where they form an extraordinary gorge, residual of an old volcano, but now got off.
They are as pentagonal or hexagonal columns and can be disposed:
1) Vertically (like canes of organ), they are situated at the Northeast of the Great Rock where they have a considerable height, near to the old port of Acitrezza placed to southern part of Lachea island.
From the harbour, they are visible from the seafront, only the heads of basalts can be admired because the columns are not emerged; the zone represents a feeding culvert that the bradyseism and the erosion have carried out and it remembers "the pavement of the Giants" of the Irish County of Antrim.