Fallowlees Flush is situated in the north-east of England in the county of Northumberland, to the west of Fontburn Reservoir and the east of Harwood Forest, 7.8 kilometres (4.8 mi) west-north-west of Netherwitton and 4.5 kilometres (2.8 mi) east-south-east of Forestburn Gate. The 2.4 hectares (5.9 acres) site is situated on a north-east facing slope descending from 210 metres (690 ft) to 190 metres (620 ft), above sea level above a stream feeding the reservoir.[1][2]
Flora
Flora on the site grades from species rich areas fed by lime-rich springs, through to a wooded fringe by the stream. The SSSI citation sets out four distinct groups of vegetation.[2]
More acidic areas of the site support water plants such as oval sedge (Carex leporina[a]) and star sedge (Carex echinata), as well as greater amounts of jointed rush.[2]