sentences:  The Messla field was discovered in 1971 and is situated 500 km southeast of Benghazi and is also considered as one of the biggest fields in the Sirte basin.Nafoora field is situated in the northeastern part of the Sirte basin and discovered in early 1965.The Beda and Hamada fields were discovered during 1959, in the eastern Sirte basin and the southern border of the Grahames basin respectively.