Leeds is located north-northwest of London, on the valley of the River Aire in the eastern foothills of the Pennines. The city centre lies in a narrow section of the Aire Valley at about above sea level; while the district ranges from in the far west on the slopes of Ilkley Moor to about where the rivers Aire and Wharfe cross the eastern boundary. There are also significant variations in elevation within the city itself. For example, land rises to in Cookridge, just from the city centre. The centre of Leeds is part of a continuously built-up area extending to Pudsey, Bramley, Horsforth, Alwoodley, Seacroft, Middleton and Morley.