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 connected with the main Nun and Brass rivers by numerous winding rivulets. An account of the journey says, In 1838 the boats of H.M.S. "Viper" ascended the Brass river for about . They reported that it was wide, and deep. The banks were fringed with impenetrable mangroves. On the return voyage they were assisted by a current running at along the western shore. An 1842 report to the British House of Commons said that "Slaves may be taken from the Bonny to the Brass River, and are taken there; the Brass River is not under King Peppel, and separate treaties