Benghazi is the second-most-populous city in Libya as well as the largest city in Cyrenaica, with an estimated population of 859,000 in 2023. L…Benghazi is the second-most-populous city in Libya as well as the largest city in Cyrenaica, with an estimated population of 859,000 in 2023. Located on the Gulf of Sidra in the Mediterranean, Benghazi is also a major seaport.