TheKarst Plateau or theKarst region (Slovene:Kras,Italian:Carso), also locally calledKarst, is akarst plateau region extending across the border of southwesternSlovenia and northeasternItaly.
It lies between theVipava Valley, the low hills surrounding the valley, the westernmost part of theBrkini Hills, northernIstria, and theGulf of Trieste. The western edge of the plateau also marks the traditional ethnic border betweenItalians andSlovenes. The region gave its name tokarst topography.[1] For this reason, it is also referred to as theClassical Karst.
The plateau rises quite steeply above the neighboring landscape, except for its northeastern side, where the steepness is less pronounced. The plateau gradually descends from the southeast to the southwest. On average it lies 334 m above sea level. Its western edge, known as theKarst Rim (Slovene:Kraški rob), is a continuation of theUčka mountain range in easternIstria, and rises to the east and southeast ofTrieste, ending in steep cliffs betweenAurisina andDuino. Many interesting geological phenomena occur along the Karst Rim, including the picturesqueRosandra Valley (also known as Glinščica).
Because the Karst steeply descends towards theAdriatic Sea, it is less exposed to the beneficial climatological effects of theMediterranean. In the past, the main vegetation on the plateau wasoaks, but these were replaced bypine forests in the 19th and 20th centuries.Forests now cover only one third of the Karst. Starting in theMiddle Ages, the plateau suffered radical deforestation for economic reasons. Although it is often said that much of the wood for the closely spacedpiles that support the island city ofVenice came from this region, this is unlikely. Venice perhaps used the wood for naval timber. The most radical deforestation occurred in the first half of the nineteenth century due to clear-cutting by local farmers and conversion of the land into pastures for goats and sheep.[2]
Most of the Karst is located in theSlovenian Littoral, covering an area of 429 square kilometres, with a population of about 19,000 people. The Karst as a whole has exactly 100 settlements. The town ofSežana is the center of the region on the Slovene side of the border. The main rural centers are the settlements ofDivača,Dutovlje, andKomen.Štanjel is a picturesqueclustered settlement at the top of the northern rim of theplateau; its houses are tightly clustered around Turn Hill, giving it the appearance of amedieval town. On the Italian side of the border, important settlements includeOpicina,Duino, andAurisina.
Natural conditions, including thebora (Slovene:burja) wind, and the local way of life all shaped the elements of Karstarchitecture, creating simple but well-defined forms. One of the main tourist centers in the area isLipica, with itsstud farm (the home of theLipizzan horse breed) and other tourist facilities.
Traditional Karst folk costumes in a Slovenian commemorative celebration inBasovizza nearTrieste
The vast majority of the inhabitants of the Karst Plateau are ethnicSlovenes. Traditionally, only the villages of San Martino del Carso and Poggio-Sdraussina (in the municipality ofSagrado) has been inhabited byFriulian speakers, the villages of Polazzo (in the municipality ofFogliano-Redipuglia), Vermegliano and Selz (in the municipality ofRonchi dei Legionari) byVenetian speakers, and the town ofDuino has been inhabited for long by a mixed population, while all the rest of the region was almost entirely Slovene-speaking from the Middle Ages until the end ofWorld War I, after which some thousands Italians moved in the region while it was entirely under Italy's sovereignty, and again from the late 1940s and during the 1950s, whenIstrian Italiansfleeing from Yugoslavia were settled in Karst villages in the Province of Trieste, especially in the municipality ofDuino. As a consequence, today an estimated one fifth of the population of the Karst Plateau is Italian speaking, while the rest is mostly Slovene speaking.
Historically, the region aroundPivka,Postojna andIlirska Bistrica also used to be considered as part of the Karst. This subregional identity is still documented in the late 17th century, but it weakened in the later period, replaced by anInner Carniolan identity.