Northumberland role in the Industrial Revolution from the 18th century on. Many coal mines operated in Northumberland until the widespread closures in the 1970s and 1980s. Collieries operated at Ashington, Bedlington, Blyth, Choppington, Netherton, Ellington and Pegswood. The region's coalfields fuelled industrial expansion in other areas of Britain, and the need to transport the coal from the collieries to the Tyne led to the development of the first railways. Shipbuilding and armaments manufacture were other important industries before the deindustrialisation of the 1980s. Northumberland remains largely rural, and is the least-densely populated county in England. In recent years the county has
Demographics of South Korea in 1980. Kyonggi Province, which surrounds the capital and contains Inch'on, the country's fourth largest city, was the most densely populated province; Kangwon Province in the northeast was the least densely populated province. According to the government's Economic Planning Board, the population density will be 530 people per square kilometer by 2023, the year the population is expected to stabilize. Rural areas in South Korea consist of agglomerated villages in river valleys and range from a few houses to several hundred. These villages are located in the south that are backed by hills and give strong protection from winter winds.