The Old Man of Hoy is a 449-foot (137m) sea stack on the island of Hoy, part of the Orkney archipelago off the north coast of Scotland. Formed from Old Red Sandstone, it is one of the tallest stacks in Britain. The Old Man is popular with climbers, and was first climbed in 1966. Created by the erosion of a cliff through hydraulic action some time after 1750, the stack is no more than a few hundred years old, and may soon collapse into the sea.

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