The Black Sea Lowland covers about half of the territory of the oblast. In Ternivka, a meteorite crater is located. It is in diameter and the age is estimated to be 280 ± 10 million years (Permian). The crater is not exposed at the surface. The Dnieper Upland contains a number of minerals including iron, manganese, granite, graphite, brown coal, kaolin etc. Kryvbas is an important economic region, specializing in iron ore mining and the steel industry. It is arguably the main iron ore region of Eastern Europe. Named after the city of Kryvyi Rih, the region occupies the southwestern part of the Dnipropetrovsk Oblast, as well as a small neighboring part of the Kirovohrad Oblast.