together as the Littoral Region (Primorska). White Carniola (Bela krajina), otherwise part of Lower Carniola, is usually considered a separate region, as is the Central Sava Valley (Zasavje), which is otherwise a part of Upper and Lower Carniola and Styria. Slovenian Littoral has no natural island, but there is a plan on building an artificial one. Climate Humid subtropical climate (Cfa) on the coast, oceanic climate (Cfb) in most of Slovenia, continental climate with mild to hot summers and cold winters (Dfb) in the plateaus and mountains on the north, subpolar (Dfc) and tundra (ET) climate above the treeline on the highest mountain peaks. Precipitation is high away from the coast, with the spring being particularly prone to rainfall. Slovenia's Alps have frequent snowfalls during the winter. Terrain A short coastal strip on the Adriatic Sea, an alpine mountain region adjacent to Italy and Austria, mixed mountain and valleys with numerous rivers to the east. There is only one natural island in Slovenia: Bled Island in Lake Bled in the country's northwest. Lake Bled and Bled Island are Slovenia's most popular tourist destination. Elevation extremes Lowest point: Adriatic Sea 0 m (tide gauge station in Koper) Highest point: Triglav Natural resources Lignite coal, lead, zinc, building stone, hydropower, forests Land use Arable land: 8.53% Permanent crops: 1.43% Other: 90.04% (2005) Irrigated land: 100 km2 (2003) Natural hazards: minor flooding and earthquakes Environment Current issues The Sava River polluted with domestic and industrial waste; pollution of coastal waters with heavy metals and toxic chemicals; forest damage near Koper from air pollution (originating at metallurgical and chemical plants) and resulting acid rain. International agreements Party to: Air Pollution, Air Pollution-Persistent Organic Pollutants, Air Pollution-Sulphur 94, Biodiversity, Climate Change, Climate Change-Kyoto Protocol, Endangered Species, Hazardous Wastes, Law of the Sea, Marine Dumping, Nuclear Test Ban, Ozone Layer Protection, Ship Pollution (MARPOL 73/78), Wetlands, Whaling Signed, but not ratified: See also List of mountains in Slovenia Online map services of Slovenia Protected areas of Slovenia Slovene Riviera (Slovenska obala) References External links – Geodesic Institute of Slovenia – Detailed Topographic and Orthophoto maps of Slovenia