Marmarica in ancient geography referred to the part of the North African coast between Cyrenaica and Aegyptus. It corresponds to what is now the border region between Libya and Egypt, including the towns of Bomba (ancient Phthia), Timimi (ancient Paliurus), Tobruk (ancient Antipyrgus), Acroma (ancient Gonia),  Bardiya, As-Salum, Sidi Barrani (ancient Zygra). It extended southward to a considerable distance, to the inclusion of Siwa Oasis, at the time known for its sanctuary to Ammon. The eastern part of Marmarica, by some geographers considered a separate district between Marmarica and Aegyptus, was known as Libycus Nomus. In Late Antiquity, Marmarica was also known as Libya Inferior, while Cyrenaica was known as Libya Superior.