Geography and Geology
The west is machair (fertile low-lying coastal plain) with a continuous sandy beach whilst the east coast is mountainous with the peaks of Beinn Mhòr 620 metres (2,034 ft) and Hecla 606 metres (1,988 ft). The main village on the island is Lochboisdale (Loch Baghasdail), from which ferries sail to Oban on the mainland and to Castlebay (Bàgh a' Chaisteil) on Barra. The island is also linked to Eriskay and Benbecula by causeways. Smaller settlements include Daliburgh (Dalabrog), Howmore (Tobha Mòr) and Ludag.
South Uist has a bedrock of Lewisian Gneiss, high grade regional metamorphism dating back to 2900 million years ago in the Archaean. Some show granulite facies metamorphism, but most are the slightly lower temperature amphibolite facies. These formed part of the Earth’s deep ancient crust, left here when the North Atlantic was formed. These are the oldest rocks in the British Isles today and they have been brought to the surface by tectonic movements. They now bear the scars of the last glaciation which has exposed them.
"South Uist Machair" on the west coast is one of 40 National Scenic Areas in Scotland.
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—Willard Van Orman Quine (b. 1908)
“The totality of our so-called knowledge or beliefs, from the most casual matters of geography and history to the profoundest laws of atomic physics or even of pure mathematics and logic, is a man-made fabric which impinges on experience only along the edges. Or, to change the figure, total science is like a field of force whose boundary conditions are experience.”
—Willard Van Orman Quine (b. 1908)