BERRI (RU: Берри) is the petroleum field within the Saudi Arabia, one of the largest within the world. It is situated on the coastal shelf; the southern part of the field extends onto the dry land. It belongs to the Persian Gulf petroleum-and-gas-bearing basin. It has been discovered during the 1964, the development of the mainland part of the field is performed since the 1967, of the marine part since the 1971. The initial industrial reserves of petroleum are 1055 million tonnes. It is confined to the anticlinal fold with the size of 14x40 kilometres. There are productive the limestones of the Arab stratigraphic suite of the Upper Jurassic (the A and B horizons) at the depth of 2300 metres. The reservoirs are layered, vaulted. The collectors are porous and porous-cavernous. The initial layer pressure is 27 megapascals, the temperature is 82 degrees Celsius. The density of the petroleum is 876 kilograms per cubic metre, the viscosity is 8.6 centipoises, the content of S is 2.2%. There are operated 30 gushing drilled wells, the annual extraction is 26.6 million tonnes (1980); the cumulative extraction (till the 1981) is 278 million tonnes. There exist the petroleum pipeline to the Ras Tanura port. It is being developed by the "Arabian American Oil Co." national company.