River Derwent, Yorkshire

Derwent
Darwent – archaically
River
Barmby on the Marsh Tidal Barrage at the mouth of the River Derwent
Country	England
Region	Yorkshire
Tributaries
- left	River Rye, Yorkshire
- right	Pocklington Canal, River Hertford
Source	Fylingdales Moor
- location	North York Moors, Yorkshire, England
- elevation	260 m (853 ft)
- coordinates	54°22′50.10″N 0°37′23.79″W / 54.3805833°N 0.6232750°W / 54.3805833; -0.6232750
Mouth	Barmby Barrage
- location	Barmby on the Marsh, Yorkshire, England
- elevation	10 m (33 ft)
- coordinates	53°44′58″N 0°58′08″W / 53.74944°N 0.96889°W / 53.74944; -0.96889Coordinates: 53°44′58″N 0°58′08″W / 53.74944°N 0.96889°W / 53.74944; -0.96889
Length	115.1 km (72 mi)
Basin	2,057 km2 (794 sq mi)
Designated
Ramsar Wetland
Official name	Lower Derwent Valley
Designated	17 July 1985
Map of the Catchment Area of the River Derwent

[ ] Pocklington Canal

Canal Head, Pocklington Top Lock Silburn Lock Giles Lock Sandhill Lock Coates Lock Coates Bridge Bielby Arm(nature reserve) 8 Swing bridge (fixed) Walbut Lock Walbut Bridge Thornton Lock Church Bridge Start of navigable section Melbourne Arm 7 Swing bridge 6 Swing bridge 5 Baldwins Bridge 4 Swing bridge 3 Swing bridge(over Gardham Lock) Gardham Lock B1228 Hagg Bridge 2 Swing bridge 1 Swing bridge Cottingwith Lock River Derwent

The Derwent is a river in Yorkshire in the north of England. It flows from Fylingdales Moor in the North York Moors National Park, then southwards as far as its confluence with the River Hertford then westwards through the Vale of Pickering, south through Kirkham Gorge and the Vale of York, joining the River Ouse at Barmby on the Marsh. The confluence is unusual in that the Derwent converges on the Ouse at a shallow angle in an upstream direction.

The old course of the river used to flow further east, entering the Ouse east of Howden.

The River Derwent catchment area includes the Upper Derwent, River Rye, River Hertford, Bielby Beck and Pocklington canal and their tributaries. It covers an area of 2,057 square kilometres and includes the towns of Stamford Bridge, Malton, Pickering, Helmsley, Filey and Scarborough. The area is bounded by the Cleveland Hills, North York Moors and Hambleton Hills to the north, the Yorkshire Wolds and the coast to the east, the Vale of York to the west and the River Ouse and Humber Estuary to the south. The area around the river is primarily rural in nature with grazing moorland in the upland areas and a variety of agricultural uses at lower levels. There are large areas of designated conservation sites throughout the area.

It is used for water abstraction, leisure and sporting activities and effluent disposal as well as being of significant importance as the site of several nature reserves. It is the subject of conflicting interests as well as having an interesting ice age past and a long recorded history.