Noun
(literature) An account of a voyage, particularly those of Hanno and Arrian, recording ports and coastal landmarks. [1613]
A voyage along a coast. [1677]
(uncommon) Synonym of circuit: the path or distance around a coast. [1776]
(uncommon) Synonym of circumnavigation: a voyage around an island or the world. [1854]
Source: en.wiktionary.orgAs the periplus was a sort of ship's log, he probably did reach the Vistula. Source: Internet
The mainstream today recognizes periplus as a genre of navigational literature and concedes that there was only one work, "on the Ocean", which was based on a periplus. Source: Internet
This periplus of a ship from Marseilles on which the poem relies is uncertain in date, but is believed to be possibly from the 6th century BC, not long after the founding of the city. Source: Internet