Also found in: Dictionary, Wikipedia.
Pentland Firth(pĕnt`lənd fûrth), 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 IslandsOrkney Islands,
archipelago and council area (1991 pop. 19,650), 376 sq mi (974 sq km), N Scotland, consisting of about 70 islands in the Atlantic Ocean and the North Sea, N of Scottish mainland across the Pentland Firth. About 20 islands are inhabited.
..... Click the link for more information. . Its rough waters have proven dangerous to small vessels. Small islands dot the Pentland Firth.
a strait between the northern shore of Scotland and the Orkney Islands. The Pentland Firth connects the North Sea with the Atlantic Ocean. It is 26 km long and 11 km wide, with depths to 84 m. There are strong tidal currents (to 7.6 km per hour).
a channel between the mainland of N Scotland and the Orkney Islands: notorious for rough seas. Length: 32 km (20 miles). Width: up to 13 km (8 miles)