Derwent, the name of several rivers of England.' I. A river of Cumberland, 32 m. long, rising in the district of Borrowdale, and flowing N. and then S. W. into the Irish sea, which it enters near Workington. It forms the cataract of Lodore near its head waters, and the lake of Derwent water near Keswick, where it is joined by the Greta; expands into Bassenthwaite water at the town of that name, and receives the river Cocker at Cockermouth. Its banks abound in rich and varied scenery. II. A river of Derbyshire, rising in a place called "the trough," in the mountains which extend along the N. boundary of the county, and uniting with the Trent on the borders of Leicestershire, after a course of about 50 m. Its general course is S. E. It passes Chats-worth house and the towns of Matlock, Belper, and Derby. Its scenery, particularly in the upper part, is beautifully diversified. III. A river of Yorkshire, East Riding, rising near Harwood dale, flowing nearly S. with many windings, and falling into the Ouse at Barmby, after a course of about 60 m.
It is navigable to Malton, 27 m. above its mouth.
Derwent, a river of Tasmania, rising near the centre of the island in Lake St. Claire, flowing S. E. into the district of Norfolk, and entering the S. Pacific ocean through an estuary which separates the districts of Hobart Town and Richmond. The estuary is about 4 m. broad at its entrance, and retains this width for a distance of 6 or 8 m. inland. On Iron Pot island at its mouth is a lighthouse with a fixed light 70 ft. above the sea.