These four reservoirs are close to Tring on the border of Hertfordshire and Buckinghamshire – they are Tringford (the smallest), Startop, Marsworth and Wilstone (the largest). Tringford, Startop and Marsworth are all adjoining, separated only by pathways and roads; while Wilstone is a little way to the west, close to the village of the same name. Collectively, they form a 106.5 ha Site of Special Scientific Interest and provide a rewarding place for bird-watching, with species such as black-necked grebes at Wilstone and ringed plovers at Startop. The Canal and River Trust allow coarse fishing on the reservoirs, notably for large bream, trout and wels catfish. An extensive network of public footpaths and canal towpaths provide accessibility to the site.