Canterbury is a cathedral city and UNESCO World Heritage Site, in the county of Kent, England; it was a county borough until 1974. It lies o…Canterbury is a cathedral city and UNESCO World Heritage Site, in the county of Kent, England; it was a county borough until 1974. It lies on the River Stour. The city has a mild oceanic climate. Canterbury is a popular tourist destination, with the city's economy heavily reliant upon tourism, alongside higher education and retail. As of 2011, the city's population was over 55,000, including a substantial number of students and one of the highest student-to-permanent-resident ratios in Britain.