By 2020, it is expected to cover areas at an altitude from 200m to 600-700m. This area includes the northern half of the Danube Plain, southern Dobrudzha, part of the Upper Valley and the Black Sea coast except for Strandzha Mountain. In 2050, Zone B will reach 600-800 m above sea level and include areas of the Danube Plain, Dobrudzha, Fore Upper Valley, much of the Middle forest Strandja Sofia field. By 2020, it is expected to cover small areas in the southern border region and sub-belt highland forests of beech, fir and spruce.