Petroleum industry in Nigeria to transport the crude oil. Also because of the lack of highly productive fields, money from the jointly operated (with the federal government) companies is constantly directed towards petroleum exploration and production. Nigeria's petroleum is classified mostly as "light" and "sweet", as the oil is largely free of sulphur. Nigeria is the largest producer of sweet oil in OPEC. This sweet oil is similar in composition to petroleum extracted from the North Sea. This crude oil is known as "Bonny light". Names of other Nigerian crudes, all of which are named according to export terminal, are Qua Ibo, Escravos blend,
Brass River vessels of draft. It was often used by merchant steamers trading on the Niger, since the entrance of the Brass was easier than that of the Nun. Many factories lay on the east shore of the Brass just inside the entrance, handling the extensive trade in palm oil and ivory. At that time Akedo, about above cape Nun, was the market place for traders from the Brass river. The town of Twon-Brass lies near the mouth of the Brass River. This was a slaving port in the early 19th century, and later a collection point for palm oil and kernels.