Southern England, also known as the South of England or the South, is a sub-national part of England with cultural, economic and political differences from both the Midlands and the North. The Midlands form a dialect chain in a notable north–south divide of England. The sub-national area's official population is nearly 28 million and an area of 62,042 square kilometres (23,955 sq mi): roughly 40% of United Kingdom's population and approximately a quarter of its area.