The reservoir is officially named the Brent Reservoir, but 'Welsh Harp' originated from a 19th-century inn of the same name located near the site.
The site is designated as a Site of Special Scientific Interest (SSSI) due to its role as a breeding ground for various waterbirds.
The reservoir provides water to the Grand Union Canal system, which historically linked London to Birmingham.
It is one of the largest areas of open water in London, spanning over 100 hectares.
The site hosts a unique variety of habitats, including rare reedbeds and neutral grasslands that are scarce in the London area.
During the winter, the reservoir acts as a vital stopover point for migratory birds escaping colder climates.
The Welsh Harp Open Space, also known as the Brent Reservoir, is a 170-hectare Site of Special Scientific Interest (SSSI) designated for its diverse wetland habitats. The area serves as a critical nesting site for Great Crested Grebes, which are historically associated with the reservoir. Visitors can access the Welsh Harp Environmental Education Centre, which provides programming focused on local ecology and biodiversity. The site encompasses open water, marshland, woodland, and hedgerows, supporting a wide range of bird species and rare plant life. It is managed in partnership by the Canal & River Trust, the London Borough of Barnet, and the London Borough of Brent. The reservoir itself was originally created in the early 19th century to supply water to the Grand Union Canal. Walking trails weave through the surrounding grasslands and forested areas, providing corridors for wildlife across an urban landscape. It functions as an essential green lung for North-West London, offering a refuge for both migratory and resident waterfowl.
The viewing points along the southern bank looking out over the main body of the reservoir.
Wear waterproof footwear, as the paths can become muddy during the winter and spring months.
Bring binoculars for birdwatching, as the reservoir attracts species that are otherwise difficult to spot in the city.
Keep dogs on a lead in designated areas to protect nesting waterfowl and ground-nesting birds.
Avoid walking off the marked paths, as the marshy terrain can be hazardous and ecologically sensitive.
Respect wildlife by maintaining a quiet distance; do not feed bread to the waterfowl.
