Tarfessock is a hill in the Range of the Awful Hand, a sub-range of the Galloway Hills range, part of the Southern Uplands of Scotland.

A craggy hill, it is the lowest Donald in the range, being completely obscured by Kirriereoch Hill when viewed from the Merrick.

A nearby south top is dotted with a series of lochans.

A farmhouse of the same name is located to the west,[4] which along with the hill was at one time the property of the Marquess of Ailsa.

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