 Oldham 's topography is characterised by its rugged , elevated Pennine terrain . It has an area of 6 @.@ 91 square miles ( 17 @.@ 90 km2 ) . The geology of Oldham is represented by the Millstone Grit and Coal Measures series of rocks . The River Beal , flowing northwards , forms the boundary between Oldham on one side and Royton and Shaw and Crompton on the other . 
 Oldham <a href='null_genetive' title='1'><mark>'s</mark></a>topography is characterised by its rugged , elevated Pennine terrain . It <a href='got' title='2'><mark>has</mark></a> an area of 6 @.@ 91 square miles ( 17 @.@ 90 km2 ) . The geology of Oldham is represented by the Millstone Grit and Coal Measures series of rocks . The River Beal , flowing northwards , <a href='uninflect' title='3'><mark>forms</mark></a> the boundary between Oldham on one side and Royton and Shaw and Crompton on the other . 
Oldham  topography is characterised by its rugged , elevated Pennine terrain . It got an area of 6 @.@ 91 square miles ( 17 @.@ 90 km2 ) . The geology of Oldham is represented by the Millstone Grit and Coal Measures series of rocks . The River Beal , flowin northwards , form the boundary between Oldham on one side and Royton and Shaw and Crompton on da other .