Runnymede is a water-meadow alongside the River Thames in the English county of Surrey, and just over 20 miles (32 km) west of central London. It is notable for its association with the sealing of the Magna Carta, and as a consequence is the site of a collection of memorials. The name Runnymede is used commonly now to refer to land in National Trust ownership in the Thames flood plain south-west of the river between Old Windsor and Egham.