OL30 Yorkshire Dales: Northern & Central AreasMap 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 Wharfe. From Great Black Hill to Ramsgill, the OS Explorer map of the North and