Cockermouth is a market town and civil parish in the Cumberland unitary authority area of Cumbria, England, so named because it is at the confluence of the River Cocker as it flows into the River Derwent. The mid-2010 census estimates state that Cockermouth has a population of 8,204, increasing to 8,761 at the 2011 Census.

Buttermere is a lake in the Lake District in North West England. It has a length of approximately 2 kilometres (1.2 mi) and a maximum width of 0.54 kilometres (0.34 mi), an area of 0.9 square kilometres (0.35 sq mi), a maximum depth of 28.6 metres (94 ft), and a surface elevation of 100.3 metres (329 ft) above sea level. Its primary outflow is Buttermere Dubs, a short stream which connects the lake to Crummock Water. From Crummock Water the River Cocker flows to Cockermouth, where it joins the River Derwent and finally enters the Irish Sea at Workington. The lake is in the unitary authority of Cumberland, and the ceremonial county of Cumbria.