Concern about biodiversity conservation remains strong within the country. In 1998 the Government of Bulgaria approved the National Biological Diversity Conservation Strategy, which was inspired by the Pan European Strategy for Biological and Landscape Diversity. Bulgaria has some of the largest Natura 2000 areas in the European Union covering 33.8% of its territory. The national policy for governing and management of the protected areas is implemented by the Ministry of Environment and Water. Bulgaria's biodiversity is conserved in three national parks, 11 nature parks and 54 nature reserves. Of them, Pirin National Park and Srebarna Nature Reserve are included in the UNESCO World Heritage List. Spanning a territory of 1,161 square kilometres Strandzha Nature Park is the largest protected area in the country. Established in 1936 Vitosha Nature Park is the oldest in Bulgaria and in the Balkan Peninsula.