The Old Man of Hoy, a sea stack formed from Old Red Sandstone, can be found in the northwest on the Rackwick coast. It is one of the tallest stacks in the United Kingdom at a height of . The Old Man is popular with climbers, and was first climbed in 1966. Created by the erosion of a cliff through hydraulic action sometime after 1750, the stack is no more than a few hundred years old, and a painting from 1817 shows the stack with an arch at the bottom which has now further eroded and no longer remains. It may soon collapse into the sea.
The Old Man of Hoy a sea stack formed from Old Red Sandstone can be found in the northwest on the Rackwick coast It is one of the tallest stacks in the United Kingdom at a height of  The Old Man is popular with climbers and was first climbed in 1966 Created by the erosion of a cliff through hydraulic action sometime after 1750 the stack is no more than a few hundred years old and a painting from 1817 shows the stack with an arch at the bottom which has now further eroded and no longer remains It may soon collapse into the sea