Mullach an Eilein

Rising sheer from the North Atlantic, this formidable summit is the highest point of Boreray in the St Kilda archipelago. It offers a dizzying perspective over the world's largest colony of northern gannets, with the jagged sea stacks of Stac Lee and Stac an Armin piercing the ocean directly below.

• •The name is Scottish Gaelic for "the summit of the island," a literal description of the highest point on this dramatic, cliff-bound sea stack.
• •Despite the near-vertical terrain, St Kildans traditionally scaled these cliffs to harvest gannets and graze their unique, primitive Boreray sheep, which still live ferally on the island today.
• •The summit provides an unparalleled perspective on Stac Lee and Stac an Armin, two of the UK's highest sea stacks, which appear as jagged teeth rising from the Atlantic swell.
• •Reaching the top requires not just a difficult boat landing and calm seas, but the kind of rock-climbing nerves that make this one of the least-visited Marilyns in the British Isles.