South Croydon in south London is the area surrounding the valley south of central Croydon and running as far south as the former Red Deer public house on the Brighton Road. It is bounded by Waddon to the West and Selsdon and Sanderstead to the East. It is part of the South Croydon (CR2) post town and in the London Borough of Croydon.

Sanderstead is a village and medieval-founded church parish at the southern end of Croydon in south London, England, within the London Borough of Croydon, and formerly in the historic county of Surrey, until 1965. It takes in Purley Downs and Sanderstead Plantation, an area of woodland that includes the second-highest point in London. Sanderstead sits above a dry valley at the edge of the built-up area of Greater London. Cementing its secular identity from the late 19th century until abolition in 1965 it had a civil parish council. The community had a smaller farming-centred economy until the mid 19th century.