Thirlmere is a reservoir in the Cumberland district in Cumbria and the English Lake District. The Helvellyn ridge lies to the east of Thirlmere. To the west of Thirlmere are a number of fells; for instance, Armboth Fell and Raven Crag both of which give views of the lake and of Helvellyn beyond.
Location: Lake District National Park, Cumbria, England
Lake type: Reservoir
Primary inflows: Launchy Gill, Dob Gill, Wyth Burn, Birkside Gill
Primary outflows: Thirlmere Aqueduct (engineered off-take); St John's Beck (natural)
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