The Loch of Spiggie was historically a voe (Shetland Dialect: fjord or inlet) in which a sand bar formed, cutting off the sea.
It is considered "the only moderately large loch" in the South Mainland of Shetland, and is the fourth longest loch in Shetland.
It is roughly rectangular, with the longest dimension approximately north–south, and the maximum width is almost 0.5 miles (0.8 km); its area is roughly 1 km².

The loch is an RSPB nature reserve.
The loch supports many species of birds, including lapwing, tufted duck, redshank, snipe and whooper swan.
Additionally, various seasonal visiting birds also make use of the loch – in spring, long-tailed duck and skylark; and in summer, oystercatcher, curlew, mallard, arctic tern, kittiwake and great skua.
The birds breed in the marshes and farmland next to the loch.
The Loch of Spiggie was historically a voe (Shetland Dialect: fjord or inlet) in which a sand bar formed, cutting off the sea. It is considered "the only moderately large loch" in the South Mainland of Shetland, and is the fourth longest loch in Shetland. It is roughly rectangular, with the longest dimension approximately north–south, and the maximum width is almost 0.5 miles (0.8 km); its area is roughly 1 km².
The loch is an RSPB nature reserve. The loch supports many species of birds, including lapwing, tufted duck, redshank, snipe and whooper swan. Additionally, various seasonal visiting birds also make use of the loch – in spring, long-tailed duck and skylark; and in summer, oystercatcher, curlew, mallard, arctic tern, kittiwake and great skua. The birds breed in the marshes and farmland next to the loch.
Lochs of Spiggie and Brow