During the Iron Age and Classical antiquity, Libya (from Greek Λιβύη: Libyē, which came from Berber: Libu) referred to the area of North Africa directly west of the Nile river (Modern day Libya, Tunisia, Algeria and Morocco), not to be confused with modern country Libya which only represents the eastern part of the territory at the time. Ancient Libya was one of the three parts of the world of the ancients (Libya, Asia, Europa)[1] the territory also had part of the Mediterranean Sea named after it called the Libyan Sea or Mare Libycum which was the part of the Mediterranean south of Crete, between Cyrene and Alexandria.
Greek and Roman geographers placed the dividing line between Libya and Asia at the Nile because the entire region south of the mediterranean and west of the nile was homogeneous linguistically and racially by a race of Libyan people (berbers)[2][3][4][5] The area was divided during Roman times into four main regions: Mauretania, Numidia, Africa Preconsularis and Libya which retained the original name, In contrast, the areas of Sub-Saharan Africa were known as Aethiopia, It was much later, that the name Africa was extended to the whole continent instead of just the Roman Province of Africa.
For the ancient Greeks, almost everything south of the Mediterranean Sea and west of the Nile was referred to as 'Libya'. This was also the name given by the ancient Greeks to the Berber people who occupied most of that land. The ancient Greeks believed their world was divided into three greater 'regions', Europa, Asia and Libya, all centred around the Aegean Sea. They also believed that the dividing line between Libya and Asia was the Nile River, placing half of Egypt in Asia and the other half in Libya. For many centuries, even into the late medieval period, cartographers followed the Greek example, placing the Nile as the dividing line between the landmasses.
Now as you sail into the strait at the Pillars, Libya lies on your right hand as far as the stream of the Nile, and on your left hand across the strait lies Europe as far as the Tanaïs. And both Europe and Libya end at Asia.
The whole globe is divided into three parts, Europe, Asia, and Africa. Our description commences where the sun sets and at the Straits of Gades, where the Atlantic ocean, bursting in, is poured forth into the inland seas. As it makes its entrance from that side, Africa is on the right hand and Europe on the left; Asia lies between them; the boundaries being the rivers Tanais and Nile.
If then our judgment of this be right, the Ionians are in error concerning Egypt; but if their opinion be right, then it is plain that they and the rest of the Greeks cannot reckon truly, when they divide the whole earth into three parts, Europe, Asia, and Libya; they must add to these yet a fourth part, the Delta of Egypt, if it belong neither to Asia nor to Libya; for by their showing the Nile is not the river that separates Asia and Libya; the Nile divides at the extreme angle of this Delta, so that this land must be between Asia and Libya.