The Greek travelogue from the 1st-century AD, known as the Periplus of the Erythraean Sea, initially describes the littoral, based on its author's intimate knowledge of the area. However, the Periplus does not mention any dark-skinned "Ethiopians" among the area's inhabitants. They only later appear in Ptolemy's Geographia in a region far south, around the "Bantu nucleus" of northern Mozambique.