The Karachaganak Field is one of the world's largest gas condensate fields. It is located in the Pre-Caspian (or North Caspian) Basin, which extends from the southeastern margin of the Russian Platform down to the northern coast of the Caspian Sea, and includes the offshore Caspian Sea north of about 44° N. The North Caspian is a pericratonic depression of Late Proterozoic-Early Paleozoic age. Sediments in the basin are up to thick in places. The basin is subdivided into numerous zones by large salt domes, and the primary salt layer, the Permian Kungurian salt, separates strata vertically into subsalt and suprasalt layers. The basin is bounded to the east by the Hercynian Ural Mountains and to the southeast and south by other orogenic belts. In the north, the basin lies on the flank of the Voronezh Massif in the west and the Volga-Ural Platform in the north. Numerous oil and gas fields have been discovered in this region in addition to Karachaganak, such as Astrakhan, Tengiz and Zhanazhol Fields.