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
England–Scotland football rivalry Scotland. Joe Baker was the first player to play for England without having played in the Football League, but his was an isolated example because he played at a time when a player was only allowed to play for the country of his birth. Those rules have subsequently been relaxed and the sons or even grandsons of Scots are now allowed to play for Scotland. This means that some footballers born in England have played in "and for" Scotland, including Andy Goram and Stuart McCall. There was an influx of English players to the Scottish league during the late 1980s