sentences:  It is in the centre of the Weald in the Low Weald, at the western edge of the High Weald, with the Surrey Hills of the North Downs to the north and the Sussex Downs of the South Downs to the south.The River Arun rising from ghylls in the St Leonard's Forest area, to the east of Horsham, cuts through the south of the town then makes its way through Broadbridge Heath.The Arun is joined by a number of streams flowing down from the north, which rises around Rusper.