Ennerdale is a valley in Cumbria, England. Ennerdale Water, fed by the River Liza, is the most westerly lake in the Lake District National Park.
Due to the remote location, the lack of a public road up the valley, and its management by Forestry England, the National Trust and United Utilities, Ennerdale is relatively unspoiled. Ennerdale Water has not been as affected as other lakes in the National Park by construction, activity on the lake or the trappings of tourism. In 2022 the partners managing Ennerdale, together with Natural England, put together a successful proposal to declare much of the Ennerdale Valley as a National Nature Reserve (NNR).[1]