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
Mountains and hills of England East England, including East Anglia and London, is also predominantly flat. The underlying rock is chalk, and meaningful heights are only attained in the Chiltern Hills (Haddington Hill: ), the North Wessex Downs (Walbury Hill: ), the North Downs (Leith Hill: ) and the South Downs (which includes the chalk cliffs at Beachy Head and Seven Sisters). South of Bristol and Bath, the Mendip Hills (Black Down: ) are the first group of hills in South West England. The Purbeck Hills (and their continuation onto the Isle of Wight) line the south coast, and a number of other groups of