From wikipedia

Numidia was an ancient African Berber kingdom and later a Roman province on the northern coast of Africa between the province of Africa (where Tunisia is now) and the province of Mauretania (which is now the western part of Algeria's coastal area). What was Numidia then is now the eastern part of Algeria's coast.

The region that constituted Numidia in Roman usage, became more specific and more constricted with time. Beginning as the territory west of Carthage in the 3rd century BCE, when Numidia was applied by Polybius and other historians to the whole Maghreb as far as the river Mulucha (Muluya), about 100 miles west of Oran, the Numidians were conceived of as two great tribal groups, the Massyli in eastern Numidia, and the Massaesyli in the west. At the time of the Second Punic War the eastern tribes took the side of the Romans whereas the Massaesyli supported the Carthaginians. At the end of the war the victorious Romans gave all of Numidia to Massinissa (died 148 BCE) of the Massaesyli, whose territory extended from Mauretania to the boundary of the Carthaginian territory, and also southeast as far as Cyrenaica, so that Numidia entirely surrounded Carthage (Appian, Punica, 106) except towards the sea

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