Freiburg im Breisgau's parks, green spaces, recreational facilities, playgrounds, roadside greeneries and the Mundenhof add up to an area of 397 hectares (980 acres), which corresponds to 18.05 square metres (194.3 sq ft) of green space per Freiburg citizen. On average, major cities in Baden-Württemberg have 22.66 square metres (243.9 sq ft) of green space per citizen. However, there is an area of 2,600 hectares (6,400 acres) of forest in the proximity of Freiburg as well as additional recreational area like the Rieselfeld district (a former sewage farm). The majority of the green spaces came into existence from the 1960s on.