Pentland Firth pĕnt´lənd fûrth [key], channel, 6 to 8 mi (9.7–12.9 km) wide and c.14 mi (23 km) long, N Scotland. Connecting the North Sea with the Atlantic Ocean, it separates the Scottish mainland from the Orkney Islands . Its rough waters have proven dangerous to small vessels. Small islands dot the Pentland Firth.
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