Northern England cities like Manchester and Leeds, nor the majority of Yorkshire. Northern England is not a homogenous unit, and some have entirely rejected the idea that the North exists as a coherent entity, claiming that considerable cultural differences across the area overwhelm any similarities. Through the North of England run the Pennines, an upland chain, often referred to as "the backbone of England", which stretches from the Tyne Gap to the Peak District. Other uplands in the North include the Lake District with England's highest mountains, the Cheviot Hills adjoining the border with Scotland, and the North York Moors near the
North–South divide (England) in Yorkshire and Alderley Edge, Wilmslow, Bowdon and Chester in Cheshire. On the other hand, geographically southern areas such as the Isle of Thanet in Kent have struggled with the same industrial decline as parts of the north. Cornwall, many London boroughs such as Hackney and Haringey and southern towns like Luton are other anomalies to the North-South divide with poor health and education. This has led some commentators to suggest that other divisions, such as class or ethnicity might be more important. The Economist claims that one of the main causes of the divide was the migration of young