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
White Nile built. A ferry connects the roads between Adjumani and Moyo, and navigation of the river is otherwise done by small boat or canoe. From the point at which the river enters South Sudan from Uganda the river goes under the name of "Mountain Nile". From Lake No in South Sudan the river becomes the "White Nile" in its strictest sense, and so continues northwards into Sudan where it ends at its confluence with the Blue Nile. From Nimule in South Sudan, close to the border with Uganda, the river becomes known as the "Mountain Nile" or "Baḥr al-Jabal" (also "Baḥr