Bristol is a city in south west England, near the Bristol Channel coast, approximately 106 miles (170 km) west of London. Several factors have influenced the development of its transport network. It is a major centre of employment, retail, culture and higher education, has many historic areas, and has a history of maritime industry. The city has a population of 450,000, with a metropolitan area of 650,000, and lies at the centre of the former County of Avon, which includes many dormitory towns, and has a population of one million.