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.
Whalsay, "whale island" (975), measuring 5 m.
Whalsay is built of coarse gneisses and schists.
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