 To the east of this river the surface rises to a height of 1 @,@ 225 feet ( 373 m ) at Woodward Hill , on the border with the parish of Saddleworth . The rest of the surface is hilly , the average height decreasing towards the southwest to <unk> and the city of Manchester . The ridge called Oldham Edge , 800 feet ( <unk> m ) high , comes southward from Royton into the centre of the town . 
