The valley rises in the central Lake District, and runs north carrying the River Derwent into the lake of Derwentwater. The waters of the river have their origins over a wide area of the central massif of the Lake District north of Esk Hause and Stake Pass. These origins include drains from the northern end of Scafell, Great End, the eastern side of the Dale Head massif, the western part of the Central Fells and all the Glaramara ridge. Near Rosthwaite the side valley of Langstrath joins the main valley from Seathwaite before the combined waters negotiate the narrow gap known as the Jaws of Borrowdale. Here it is flanked by the rocky crags of Castle Crag and Grange Fell. The valley then opens out around Grange before the river empties into Derwentwater, overlooked by Catbells, Skiddaw and Walla Crag.