The area roughly spans from the River Trent to the Scottish border in the north. However, people disagree about where the southern border is. Some people say Northern England starts near Birmingham, while some people say it only starts at the River Tees. The government says that Northern England is made up of three statistical regions: the North East, North West and Yorkshire and the Humber. These have a combined population of around 14.9 million as of the 2011 Census and an area of 37,331 km (14,414 sq mi). 