[1] They include each of Austria's most important natural landscape types — alluvial forest, Alpine massif, Pannonian steppe and rocky valleys.
However, the national park project was abandoned in the late 1930s and not resumed until 1971, when the federal states of Salzburg, Tyrol and Carinthia signed the Heiligenblut Agreement, followed by similar initiatives in Lower and Upper Austria.
The park centres provide the public with educational services on ecology and environmental protection, information and leisure activities.
The Neusiedler See–Seewinkel and Thayatal national parks stretch across the border with Hungary and the Czech Republic respectively.
The Nock Mountains (formerly also one of Austria's National Parks) had been classified as a Protected Landscape (Category V), and in 2012 it was converted into the core zone of a UNESCO Biosphere Reserve.