From Galicia, the Bastarnae expanded into the Moldavia and Bessarabia regions, reaching the Danube Delta. Strabo describes the Bastarnae as inhabiting the territory "between the "Ister" (the Danube) and the "Borysthenes" (the Dnieper)". He identifies three sub-tribes of the Bastarnae: the Atmoni, Sidoni and Peucini. The latter derived their name from Peuce, a large island in the Danube Delta which they had colonised. The 2nd-century geographer Ptolemy states that the "Carpiani" or Carpi (believed to have occupied Moldavia) separated the Peucini from the other Bastarnae "above Dacia" (i.e. north of Dacia).