Traditional fishing boat were used for war and trade. Some ancient vessels were propelled by either oars or sail, depending on the speed and direction of the wind (see trireme and bireme). The Chinese were using sails around 3000 BC, of a type that can still be seen on traditional fishing boats sailing off the coast of Vietnam in Ha Long Bay. A jangada is an elegant planked fishing boat used in northern Brazil. It has been claimed the jangada dates back to ancient Greek time. It uses a triangular (lateen) sail, which allows it to sail against the wind. A felucca is
Senegal River from the Arabic, either "Wad al-mal" ("River of Treasure", i.e. Gold) or, alternatively, "Wad al-Melli" ("River of Mali") or even, by transcription error, "Wad al-Nill" ("River of Nile"). Other etymological theories for "Senegal" abound. A popular one, first proposed by Fr. David Boilat (1853), was that "Senegal" comes from the Wolof phrase "sunu gaal", meaning "our canoe" (more precisely, "our pirogue"). Bailot speculates the name probably arose as a misunderstanding, that when a Portuguese captain came across some Wolof fishermen and asked them what the name of the river was, they believed he was asking who their fishing boat belonged