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The island of Stroma is the more southerly of the two islands in the Pentland Firth between the Orkney Islands and Caithness on the Scottish mainland. It lies about 2 miles (3 kilometres) northwest of John o' Groats on the mainland. The island divides the firth into two channels, the Inner Sound to the south and the Outer Sound to the north.

Mostly low-lying and flat, the island is oriented in a north-south direction, measuring about 2 mi (3 km) long by 1 mi (2 km) wide. It is now uninhabited; the last of the islanders having left in 1962. The island is now owned by one of its former inhabitants, who uses it to graze sheep.