The vegetation density on planted areas is some 625 trees per ha. In the valleys of the Kopetdag Mountains, for instance, specially planted oaks can be found, which are 100 years old (and more), and there is also evidence that oriental plane, mulberry, walnut and other trees were planted. It was in 1968 that planned and systematic work aimed at creating artificial (human-made) plantations really began on a full scale. These efforts involved planting trees in mountain areas, in the desert and on irrigated land specially created within the confines of the territory owned by the State forestry authorities.