In Scotland and northern England, a Linn is a geographical water feature, a watercourse that has cut through a shelf of hard rock creating a narrow (usually), steep-sided crevice (fracture) through which it runs. Typically one named after a river or area can have application even for more than one such feature. The photograph of the Linn of Dee illustrates the attributes of a typical 'Linn'. In Gordon (1925) the author describing a walk down Glen Avon in the Cairngorms mentions two Linns on the River Avon - first: "A couple of miles below Faindouran Lodge the A'an is spanned by a bridge. Here the river is narrow, with foaming rapids and deep pools where salmon lie of a September day. Beside the Linn, on the damp granite ledges ..."

• Gordon (1925) (p61) Second: "At the Linn beside Inchrory the A'an thundered through its rocky gorge. Before midsummer salmon and grilse reach the deep pools of the Linn ..."
• Gordon (1925) (p62-63) A linn may also refer to a waterfall or a pool at the foot of a waterfall, with the derivation a confusion of Scots Gaelic linne (pool) and Old English hlynn (torrent).

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