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Lying off the west coast of Mainland Shetland adjacent to the village of Bigton, St Ninian's Isle is connected to the main island by a shell-sand tombolo, reckoned to be the finest (and largest active) example in the British Isles.
St Ninian's occasionally becomes a true island when tides and weather combine to inundate the tombolo, but usually it is, strictly speaking, a peninsula.
The little island has an area of approximately 178 acres (72ha) and rises to a maximum elevation of 174' (53m). According to the information board on the Bigton side of the tombolo, the coastal walk around the island is approximately 3½ miles (5.3km) long and will take about 1½ - 2 hours to complete. This board also tells us that the island was inhabited until 1775, though Wikipedia gives a date of 1796.
On 4th July 1958, a schoolboy, Douglas Coutts, who was helping visiting archaeologists, uncovered the fantastic Pictish silver "St Ninian's Isle Treasure" dating from c.800 AD see Link and Link for more details.