sentences:  The parish contains the sources of Lancashire's River Calder, Yorkshire's River Calder and the River Irwell.It lies astride the main watershed of Great Britain, as the Lancashire Calder and the Irwell flow west (via the rivers Ribble and Mersey respectively) to the Irish Sea, whilst the Yorkshire Calder flows east (via the Aire, the Ouse and the Humber) to the North Sea.Everage Clough, a tributary of the Lancashire Calder, forms the parish's western boundary as far as Crown Point, the location of the Singing Ringing Tree sculpture.