Elevation: 178m (584ft) Depth: 131ft
Location: Central Fells    
Thirlmere is a large reservoir that used to be two smaller lakes; Wythburn Water and Leathes Water. A dam was constructed at the northern tip to flood the valley. The villages of Armboth and Wythburn were flooded in the process. It is a well seen lake thanks to the A591 running alongside with great views down to the lake.

Thirlmere leading down to Dunmail Raise.
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