Under the Ptolemies, Egypt developed Red Sea ports and desert routes that connected Nile towns to maritime trade. These links helped create the logistical base that later Roman merchants would use to reach Arabia and India. The Periplus later begins from these Egyptian Red Sea departure points.
By the reign of Augustus, direct or near-direct sea travel between Red Sea ports and India expanded sharply, aided by better knowledge of seasonal monsoon winds. Ancient writers report large numbers of ships making the trip each year, signaling the growth of a regular long-distance trade system. This increased demand for practical route-and-port knowledge like that found in the Periplus.
An anonymous Greek-speaking author (often described as an Egyptian merchant) compiled the Periplus of the Erythraean Sea as a practical guide to sailing and commerce. It describes routes, ports, political conditions, and imports/exports around the Red Sea, East Africa, Arabia, the Persian Gulf, and India. Many scholars place it in the mid-1st century CE, though exact dating is debated.
The Periplus frames long-distance trade from Roman Egypt around two main Red Sea ports: Myos Hormos (farther north) and Berenike (farther south). From these bays, merchants could sail down the Red Sea, then out through the Bab al-Mandeb strait toward the Indian Ocean. These ports also depended on desert transport links back to the Nile.
Across the Red Sea from Egypt, the Periplus describes Leukē Kōmē as a fortified harbor that linked maritime traffic to an inland route to Petra under the Nabataean king. The text notes official customs collection there, showing that states tried to tax and control valuable imports. This port illustrates how sea routes and land routes were combined into one trade system.
Near the Bab al-Mandeb strait, the Periplus describes Okelis (Ocelis) as less a major market than a harbor and watering station. Its role mattered because ships had to prepare for the open-water crossing and the long Indian Ocean leg. Control of such choke points affected safety, scheduling, and the cost of voyages.
The Periplus highlights Muza on the Arabian coast as an important emporium involved in Red Sea and Indian Ocean commerce. Such ports handled regional products (especially aromatics) and served as collection points for goods moving north toward Egypt or onward toward India. The description shows how South Arabian kingdoms and merchants fit into wider interregional routes.
On the African coast (Azania), the Periplus names Rhapta as the last major port of trade along that shoreline. It emphasizes commodities like ivory and tortoise shell and notes foreign merchants and officials involved in collecting taxes. This entry shows that the network extended well beyond the Red Sea into western Indian Ocean coastal trade.
In the Persian Gulf section, the Periplus describes routes that connect Gulf ports to inland river systems leading into Mesopotamia. This matters because it shows Indian Ocean trade did not stop at the coast: goods could move inland by river and caravan. The Gulf route was another branch of the broader system described in the handbook.
The Periplus presents Barigaza (Barygaza, modern Bharuch region) as a major port tied to river navigation and inland trade. It describes difficult tidal conditions and the need for local knowledge, showing why skilled pilots and regional intermediaries mattered. Barigaza’s role helps explain how inland production zones were connected to overseas markets.
On India’s southwest coast, the Periplus identifies Muziris as a key destination associated with high-value trade such as spices (notably pepper). Modern archaeology at Pattanam (near Kodungallur) has produced evidence of long-distance exchange, and some scholars argue it may match Muziris—though the identification remains debated. Together, the text and archaeological finds show why Malabar ports became central nodes in Indian Ocean commerce.
The Periplus’ lasting outcome is that it preserves a structured, port-by-port picture of 1st-century CE Indian Ocean trade routes and decision points. It ties together departure ports in Roman Egypt, Arabian and African stops, Gulf connections, and Indian emporia into one navigable system. As a result, it remains one of the most important surviving guides for understanding how ancient merchants organized Indian Ocean trade.
Ports and routes in the Periplus of the Erythraean Sea (1st century CE)