The subsoil in Tuscany is rich in mineral resources. There are iron ore, copper, mercury and lignite mines, the famous "soffioni" (fumarole) at Larderello, and the vast marble mines in Versilia. Although its share is falling, agriculture is still important. In the region's inland areas cereals, potatoes, olives and grapes are grown. The swamplands, which used to be marshy, now produce vegetables, rice, tobacco, beets and sunflowers.