Salina (Salt mine) Slănic is located in Slanic resort , Prahova county , Muntenia , Romania. Known as the biggest salt mine in Europe, it is standing today for one of the most important watering and climatic resorts in Romania as it is situated between the valley of Prahova & Teleaien at about 44km of Ploiesti, at 400 meters of altitude, the The salt mass is 5-6 km long, about 2-3 km wide and can be exploited for several thousand years. The salt is in the form of well-developed crystals, which form a compact coarse mass, The contact surfaces between the crystals have an irregular shape, which greatly increases the cohesion and adhesion.
Going back to 1686 was the beginning of development, when the Mihail Cantacuzino backbone realized that there is a salt deposit in the area. Wanting to open a mine, he bought the Slănic estate . From the document that records the transaction, it appears that before 1685 there were old Qcne, of small depths, 5 km east in Teișani.
The reserves of the salt field have been exploited in the southeast area since October 1992.