Suilven from Melon Udrigle Beach

Suilven (Scottish Gaelic: Sùilebheinn) is a mountain in Scotland. Lying in a remote area in the west of Sutherland, it rises 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, Caisteal Liath ("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. The surrounding rocks were eroded during an episode of glaciation. Suilven was covered by the last British and Irish Ice Sheet. Prior research described Suilven and many other mountains in Northwest Scotland as nunataks, but cosmogenic isotope dating of mountaintop erratics has since disproved this hypothesis. The flow of ice created the distinctive narrow teardrop plan, while carving and scouring the vertical sides of the mountain.