Tameside is bordered by the metropolitan boroughs of Stockport and Oldham to the south and north respectively, the city of Manchester to the west and the borough of High Peak in Derbyshire to the east across Longdendale. Tameside features flat lowlands in the west and highlands in the east where the western edge of the Pennines encroaches on the borough. The hills in the east include Hartshead Pike and Werneth Low which is also a country park. As well as coal measures running north–south through the centre of the borough, there are areas of peat in the north east and there are large areas of boulder clay all over Tameside. Ashton Moss is a peat bog covering about and Denton Moor is an area of about of peat.