Slovenia is the third most-forested country in Europe, with 58.3% of the territory covered by forests. The forests are an important natural resource, and logging is kept to a minimum. In the interior of the country are typical Central European forests, predominantly oak and beech. In the mountains, spruce, fir, and pine are more common. Pine trees grow on the Karst Plateau, although only one-third of the region is covered by pine forest. The lime/linden tree, common in Slovenian forests, is a national symbol. The tree line is at .