Where the rock faces meet the North Sea, there are several sea caves accessible only by small boat. The deepest cave known locally as the “Gallery” intrudes a full hundred metres westward beneath the fertile barley fields high above. In the northern extremity of the Fowlsheugh is an offshore skerry named Craiglethy, and slightly further a skerry called Gull Craig. These lower lying rocky outcrops are an integral part of the Fowlsheugh Preserve, hosting seabird nests as well as a few harbour seals on Craiglethy, who can be seen hauling out or sunbathing on summer afternoons. Craiglethy is composed only of sandstone and volcanic material, any original overlying conglomerate material having been long eroded. There are also some volcanic sea stacks along the shoreline, vestiges of the harder rock formations surviving the erosion of surrounding softer rocks by millennia of wave action and salt spray.