The country has four patterns of drainage. In the south, the principal rivers flow southwestward or westward directly to the Gulf of Guinea — the Wouri, and lesser Dibamba, Bimbia and Mungo to the Cameroon estuary near Douala; Sanaga, Nyong, and Ntem further south along the coast; Akwayafe and Manyu (which joins Nigerian Cross), and the lesser Ndian and Meme in the north of coast.
Yaounde is the capital city, green and hilly, with chaotic traffic and meandering roads common to most capital cities spilling over with people.
Education is free in state schools and compulsory between ages 6 and 12. Government funds are available to mission and private schools. Most secondary schools have been made bilingual, with instruction in both French and English. Working alongside the public schools are the missionary schools, which have been extremely important in the history of Cameroonian education. As of 1999, public expenditure on education was estimated at 2.6% of GDP.