The Bulgarian exclusive economic zone has a total size of }} in the Black Sea. Petroleum and natural gas are found in northern Bulgaria and its EEZ in the Black Sea. Crude oil is extracted in Dolni Dabnik and Gigen in Pleven Province and in Tyulenovo, Dobrich Province. The proven reserves are 20 million tons but there are prospects for new discovering in the EEZ. Gas fields have been discovered off cape Kaliakra (reserves of 3 billion m3), Deventsi (6 billion m3), between Lovech and Etropole (est. 22 billion m3), as well as near Devetaki and Butan. It is estimated that the 14,220 m2 "Khan Asparukh" Block in the northern section of the Bulgarian EEZ has natural gas reserves of 100 billion m3.