To the east of this river the surface rise 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 Failsworth and the city of Manchester . The ridge called Oldham Edge , 800 feet ( 244 m ) high , come southward from Royton into the centre of the town .