.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}52°02′N 0°46′W / 52.04°N 0.76°W / 52.04; -0.76 Milton Keynes (/kiːnz/ ⓘ KEENZ) is a city[c] in Buckinghamshire, England, about 50 miles (80 km) north-west of London.[b] At the 2021 Census, the population of its urban area was 264,349.[7] The River Great Ouse forms the northern boundary of the urban area; a tributary, the River Ouzel, meanders through its linear parks and balancing lakes. Approximately 25% of the urban area is parkland or woodland and includes two Sites of Special Scientific Interest (SSSIs).