The imposing mouth of Fingal's Cave, Isle of Staffa, Inner Hebrides (Scotland).
Fingal's Cave is a sea cave on the uninhabited Isle of Staffa, Inner Hebrides (Scotland).
Entirely of volcanic origin, the isle consists of a basement of tuff, underneath colonnades of a black fine-grained Tertiary basalt, overlying which is a third layer of basaltic lava lacking a crystalline structure. By contrast, slow cooling of the second layer of basalt resulted in an extraordinary pattern of predominantly hexagonal columns which form the faces and walls of the principal caves.The lava contracted towards each of a series of equally spaced centres as it cooled and solidified into prismatic columns. Similar formations are found at the Giant's Causeway In Ireland.
According to the legend, the Irish giant Fionn mac Cumhaill (Fingal) built the causeway to walk from Ireland to Scotland to fight his Scottish counterpart Benandonner.