Suilven (Scottish Gaelic: Sula Bheinn) is one of the most distinctive mountains in Scotland. Lying in a remote area in the west of Sutherland, it rises almost vertically from a wilderness landscape of moorland, bogs and lochans known as Inverpolly National Nature Reserve.

Suilven forms a steep-sided ridge some 2 km in length. The highest point, known as Caisteal Liath (the Grey Castle in Scottish Gaelic), lies at the northwest end of this ridge. There are two other summits: Meall Meadhonach (Middle Round Hill) at the central point of the ridge is 723 m high, whilst Meall Beag (Little Round Hill) lies at the southeastern end.

Geologically, Suilven is formed of Torridonian sandstone, sitting on a landscape of Lewisian Gneiss. As the softer surrounding rocks eroded, a process whose duration can be counted in hundreds of millions of years, Suilven was left as an Inselberg, an "island-mountain", hence its prominence.

From the coast to the west Suilven looks like a large grey pillar, hence the name which it was given by sea-borne Vikings. From the inland side the mountain has more of the appearance of a pyramid.

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