Most of the population live in the coastal towns of Folkestone and Hythe. The north of the district mainly consists of landscape villages interspersed with woods along parts of the North Downs, while the south features a coastal expanse of lower lying, periodically reclaimed villages in less forested Romney Marsh, which has a number of communities extensively built in the medieval period and 17th century as centres of the Romney Marsh wool trade. The district's economy is influenced by the Channel Tunnel Rail Link and the M20 motorway, while the tourism and allied retail sectors provide key sources of employment.