Harrow's Green Belt covers around 4.2sq miles (1088 hectares), equivalent to eight Hyde Parks and about one fifth of the borough's total area.
Located at the northern end of the borough, the Green Belt countryside separates Harrow from the Hertfordshire towns. It also provides an important topographical landmark on the outer edge of the London Basin, with the ridge landform affording views to and from the Surrey Hills and the North Downs.
The benefits of the Green Belt include opportunities for recreation, sports, education, food production and biodiversity. The Green Belt also provides links to the wider countryside, a gathering ground for water supplies, and a 'green lung', which contributes to improved air quality and helps to combat climate change.