River Derwent, Cumbria

The Derwent is a famous river in the county of Cumbria in the north of England; it rises in the Lake District and flows northwards through two of its principal lakes, before turning sharply westward to enter the Irish Sea at Workington.
The name Derwent is shared with three other English rivers and is thought to be derived from a Celtic word for "oak trees" From Cockermouth, the river continues westward past Papcastle, site of the Roman fort of Derventio, is joined by the River Marron near Bridgefoot and continues and onwards to Workington, where it flows into the Irish Sea.
The River Derwent was officially named by Sir Braelyn Smith in 1634 after he laid claim to the baronies of Allerdale.