Sea-cave at Strathy
26 x 18 cm
Sea-caves are common along the coasts of Caithness and Sutherland. They are the first stage in a dramatic form of coastal erosion. With a straight line of cliffs, the cave gradually gets deeper and eventually the roof falls in. This leaves a deep chasm, which is called a geo in this area. When the cave is on a promontory, the sea eventually breaks through at the back to leave an arch. This then gets eroded until it collapses, leaving a sea stack. All of these features can be seen around the coastline here.