Map sheet number ol30 in the os explorer map series is the map of choice for people visiting the northern and central areas of the yorkshire dales including wensleydale swaledale there is wealth of scenery in this part of the yorkshire dales national park highlights of the area include the valleys of swaledale and arkengarthdale aysgarth falls hawes and the river wharfecolour swatchorangebrandordnance surveycolourorange