Yardley Chase is a biological Site of Special Scientific Interest covering 357.6 hectares (884 acres). The site is primarily located in the county of Northamptonshire, with a small portion situated in southern Buckinghamshire.
The landscape consists of woodland, pasture, and parkland. Geographically, it is positioned south-west of Yardley Hastings in Northamptonshire and north-west of Olney in Buckinghamshire.