Dunmail Raise is a hill in the English Lake District, the highest point (at 781 feet or 238 metres) of a pass on the Keswick-Kendal road, the A591, to the south of Thirlmere reservoir on the way to Grasmere, in the Lake District National Park. To its east is the ridge dominated by Helvellyn and Fairfield, and to the west lies the High Raise massif.
A large cairn there is reputed to be the burial mound of Dunmail, king of Cumbria (probably Dyfnwal III of Strathclyde), after whom the pass is named. It has been suggested that, as the cairn lies on the old county boundary between Cumberland and Westmorland, it may be merely a boundary marker, although firm evidence is lacking.
A water treatment plant owned and operated by United Utilities is situated nearby. Here the water is filtered by passing it through screens and microstrainers, its pH is adjusted with sodium hydroxide and it is treated with Chlorine.
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