The Pentland Firth is a seaway between Orkney and the mainland of Scotland. It is 10 kilometres (6.2 mi) wide between Brough Ness on the island of South Ronaldsay and Duncansby Head in Caithness. Orkney lies between 58°41′and 59°24′North, and 2°22′and 3°26′West, measuring 80 kilometres (50 mi) from northeast to southwest and 47 kilometres (29 mi) from east to west, and covers 975 square kilometres (376 sq mi).
The islands are mainly low-lying except for some sharply rising sandstone hills on Hoy, Mainland and Rousay and rugged cliffs on some western coasts. Nearly all of the islands have lochs, but the watercourses are merely streams draining the high land. The coastlines are indented, and the islands themselves are divided from each other by straits generally called "sounds" or "firths".
The tidal currents, or "roosts" as some of them are called locally, off many of the isles are swift, with frequent whirlpools. The islands are notable for the absence of trees, which is partly accounted for by the amount of wind.
Read more about this topic: Orkney
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