on the shore of the Adriatic Sea near the Mediterranean Sea, most of Slovenia is in the Black Sea drainage basin. The Alps—including the Julian Alps, the Kamnik-Savinja Alps and the Karawank chain, as well as the Pohorje massif—dominate Northern Slovenia along its long border with Austria. Slovenia's Adriatic coastline stretches approximately from Italy to Croatia. The term "Karst topography" refers to that of southwestern Slovenia's Karst Plateau, a limestone region of underground rivers, gorges, and caves, between Ljubljana and the Mediterranean Sea. On the Pannonian plain to the East and Northeast, toward the Croatian and Hungarian borders, the landscape is essentially flat. However, most of Slovenia is hilly or mountainous, with around 90% of its land surface or more above sea level. More than half of Slovenia, which is , is forested; ranking it third in Europe, by percentage of area forested, after Finland and Sweden. The areas are covered mostly by beech, fir-beech and beech-oak forests and have a relatively high production capacity. Remnants of primeval forests are still to be found, the largest in the Kočevje area. Grassland covers and fields and gardens (). There are of orchards and of vineyards. Geology Slovenia is in a rather active seismic zone because of its position on the small Adriatic Plate, which is squeezed between the Eurasian Plate to the north and the African Plate to the south and rotates counter-clockwise. Thus the country is at the junction of three important geotectonic units: the Alps to the north, the Dinaric Alps to the south and the Pannonian Basin to the east. Scientists have been able to identify 60 destructive earthquakes in the past. Additionally, a network of seismic stations is active throughout the country. Many parts of Slovenia have a carbonate bedrock and extensive cave systems have developed. Natural regions The first regionalisations of Slovenia were made by geographers Anton Melik (1935–1936) and Svetozar Ilešič (1968). The newer regionalisation by Ivan Gams divided Slovenia in the following macroregions: the Alps (Alpe) the subalpine landscapes (predalpski svet) the Slovene Littoral or Submediterranean Slovenia (Primorje or submediteranska Slovenija) the Dinaric plateaus of the continental Slovenia (dinarske planote celinske Slovenije) Subpannonian Slovenia (subpanonska Slovenija) According to a newer natural geographic regionalisation, the country consists of four macroregions. These are the Alpine, the Mediterranean, the Dinaric, and the Pannonian landscapes. Macroregions are defined according to major relief units (the Alps, the Pannonian plain,