You leave the fields and now enter a small portion of the National Forest. Beginning in 1990, across the former mining areas of Leicestershire, South Derbyshire and Southeast Staffordshire, almost 200 square miles of forest has been planted. It ranges from Burton-Upon-Trent in the west to Leicester in the east and will eventually link to the ancient woodlands of Charnwood and Needwood. 8.5 million trees have been planted, increasing the tree cover from 8% to 20%. Native British trees make up 85% of the trees planted, with the most commonly planted being oak, ash, poplar and Scots pine.