River Derwent, Yorkshire

Derwent Darwent – archaically
Barmby on the Marsh Tidal Barrage at the mouth of the River Derwent
Map of the Catchment Area of the River Derwent
Location
Country	England
Region	Yorkshire
Physical characteristics
Source	Fylingdales Moor
• location	North York Moors, Yorkshire, England
• coordinates	54°22′50.10″N 0°37′23.79″W / 54.3805833°N 0.6232750°W / 54.3805833; -0.6232750
• elevation	260 m (850 ft)
Mouth	Barmby Barrage
• location	Barmby on the Marsh, Yorkshire, England
• coordinates	53°44′58″N 0°58′08″W / 53.74944°N 0.96889°W / 53.74944; -0.96889
• elevation	10 m (33 ft)
Length	115.1 km (71.5 mi)
Basin size	2,057 km2 (794 sq mi)
Basin features
Tributaries
• left	River Rye, Yorkshire
• right	Pocklington Canal, River Hertford
Designation
Ramsar Wetland
Official name	Lower Derwent Valley
Designated	17 July 1985
Reference no.	301[1]

The Derwent is a river in Yorkshire in the north of England. It flows from Fylingdales Moor in the North York Moors National Park, east 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 river used to flow further east, its old course 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. There are two titles named after the River Derwent in the British peerage, Viscount FitzAlan of Derwent which is extinct and Baron Derwent.