Geography and Geology
Like most of the other islands of Orkney, the bedrock is Middle Old red sandstone of Rousay type of the Devonian period, but much eroded and tilted.
The islet is separated from Copinsay by Horse Sound, and to the south west is Corn Holm. Mainland Orkney is due west, and Auskerry and Stronsay are much further to the north. The Horse is the easternmost of the southern Orkney islands.
The Blaster Hole is a sea jet, of the type known in the Northern Isles as a gloup. When a storm blows in from the east, the aptly named Blaster Hole can produce a spout of nearly 60 metres (200 ft) highly, solely by wave power.
Read more about this topic: Horse Of Copinsay
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