Besides Mainland, the principal member of the group, the more important are Yell, Unst and Fetlar in the north, Whalsay and Bressay in the east, Trondra, East and West Burra, Papa Stour, Muckle Roe and Foula in the west, and Fair Isle in the south.
Long) and Spiggie (1 ?8222;- m.) in Mainland; and Loch of Cliff (2 m.) in Unst, and numerous short streams. The principal capes are Sumburgh Head, the most southerly point of Mainland, a bold promontory 300 ft.
In Unst the high ground on the west coast consists of gneiss, which is followed eastward by schists of various kinds, then by a belt of serpentine, 2 m.
The finest work is said to come from Unst, though each parish has its own speciality.
Uyea, "the isle," from the Old Norse oy (3), to the south of Unst, from which it is divided by the narrow sounds of Uyea and Skuda, yields a beautiful green serpentine.
Unst (1940), to the N.E.
Unst contains several places of historic interest.
Burra Firth, in the north of Unst, is flanked on both sides by magnificent cliffs, including the Noup of Unst, the hill of Saxavord (934 ft.), the Gord and Herma Ness.
Of Unst, is the most northerly point of Shetland, and the site of a lighthouse.
The island is divided into Mainland district (comprising the parishes of Northmavine, Delting, Nesting, Sandsting, Walls, Tingwall, Bressay, Lerwick and Dunrossness) and North Isles district (the parishes of Unst, Fetlar and Yell).
There are parish poorhouses in Dunrossness and Unst, besides the Shetland combination poorhouse at Lerwick.
Of the original Pictish inhabitants remains exist in the form of stone circles (three in Unst and two in Fetlar) and brochs (of which 75 examples survive).
They measured the length of the seconds-pendulum at Leith, and in Unst, one of the Shetland isles, the results of the observations being published in 1821, along with those made in Spain.