Bidein a' Ghlas Thuill (An Teallach)

An Teallach is a mountain group in Wester Ross, in the Northwest Highlands of Scotland. It lies west of Dundonnell Forest, north of Loch na Sealga, and south of Little Loch Broom. Its highest peaks are the Munros of Bidean a' Ghlas Thuill at 1062 m, and Sgùrr Fiona at 1058 m.

The mountains are mostly made of Torridonian sandstone. Like the peaks around Torridon, An Teallach has terraced sides riven with steep gullies and a sharp rocky summit crest at Sgùrr Fiona. The steepest section, known as Corrag Bhuidhe, rises above Loch Toll an Lochain. Corrag Bhuidhe's most spectacular feature is an overhanging pinnacle known as Lord Berkeley's Seat.