OS Explorer Maps OL16, OL42 & OL43 In the north of England, Northumberland National Park contains Hadrian\'s Wall and the Cheviot Hills. There are facilities for horse riders and cyclists, as well as for walkers of all abilities, from short pub walks to multi-day hillwalking tours. Northumberland National Park also has three National Nature Reserves, popular with birdwatchers and a Dark Sky park for Stargazing. This map bundle contains all 3 OS Explorer Maps for the National Park with a discount of 20% compared to the cost of buying them individually, and is available in both standard and weatherproof \'Active\' versions. Whatever activities you plan on your visit, you can make the most of it with Ordnance Survey maps. With all OL maps in this set you will receive a code for use on your iOS or Android smartphone or tablet.