This exceptional system of limestone caves comprises collapsed dolines, some 6 km of underground passages with a total depth of more than 200 m, many waterfalls and one of the largest known underground chambers. The site, located in the Kras region (literally meaning Karst), is one of the most famous in the world for the study of karstic phenomena.
Criteria for inclusion as a World Heritage Site
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vii | To contain superlative natural phenomena or areas of exceptional natural beauty and aesthetic importance. | All |
viii | To be outstanding examples representing major stages of earth's history, including the record of life, significant on-going geological processes in the development of landforms, or significant geomorphic or physiographic features. | All |
About the source
Within UNESCO's broad remit, this specialised agency of the UN works towards international cooperation agreements to secure the world's cultural and natural heritage, designating venues of exceptional value as World Heritage Sites.


Episcopal Complex of the Euphrasian Basilica in the Historic Centre of Poreč
The group of religious monuments in Porec, where Christianity was established as early as the 4th century, constitutes the most complete surviving complex of its type. The basilica, atrium, baptistery and episcopal palace are outstanding examples of rel…