Strandzha Nature Park ( Priroden park Strandzha, also transliterated as Stranja Nature Park) is the largest protected area in Bulgaria spanning a territory of in the Strandzha Mountain in the extreme south-eastern corner of the country on the border with Turkey. It was established on 25 January 1995 to protect ecosystems and biodiversity of European importance, as well as the traditional cultural, historical and folklore heritage of the region. The altitude varies from on Gradishte Peak to at the Black Sea coast with average length of from west to east and from north to south.