Eastern world
The Chittagong area has been a recorded seaport since the 4th century BCE. In the 2nd century, the harbor appeared on Ptolemy's map, drawn by the Greco-Roman cartographer Claudius Ptolemy. The map mentions the harbor as one of the finest in the Eastern world. The "Periplus of the Erythraean Sea" documents trade between Chittagong and private merchants from Roman Egypt.