Val d'Agri is a sub-region of Basilicata between the Sirino and Volturino mountains. It takes its name from the Agri River, which runs through its entire territory. It is one of the most important areas of the region both in terms of culture and economy; in fact, in the first half of the twentieth century oil fields were discovered in these areas, but it was only in the eighties that exploitation began and today the oil of the Val d'Agri provides more than 10% of the national needs, being the largest onshore oil field in Europe. This figure is destined to increase, given the ongoing projects and works to expand the wells, which are not yet fully exploited. In the last decade, additional oil deposits have been discovered, so much so that it is assumed that the valley is home to the largest oil field in Europe. But there is also an important winter tourism due to numerous ski slopes and a cultural-naturalistic tourism due to the beauty and richness of the places. The area is partly included in the Val d'Agri and Lagonegrese National Park.