The Discoverer series are designed for tourist and leisure activities. Each one covers an area of 40km x 30km at the scale 1:50,000. There are 93 sheet in the series. Discoverer Sheet No. 7 covers Londonderry and includes Limavady, Eglington and Dungiven. Publisher: Land & Property Services Collection: Irish Discoverer Publication date: 2018 Dimensions: 117 x 179 x 29 Cover type: Sheet map, folded