The topography of Bosnia and Herzegovina features hills, mountains, and valleys. Approximately 50% of the land is forested. The country has three main geographic zones: high plains and plateaus along the northern border with Croatia, low mountains in the center, and the higher Dinaric Alps which cover the rest of the country. Approximately 10% of the land in Bosnia and Herzegovina is arable. Bosnia and Herzegovina's natural resources include coal, iron, bauxite, manganese, timber, wood products, copper, chromium, lead, and zinc. Bosnia and Herzegovina is subject to frequent and destructive earthquakes.