Chad Basin demand for ivory, but stocks have since recovered. The seasonal Korama River in the south of Niger does not reach Lake Chad. Nigeria includes two sub-basins that drain into Lake Chad. The Hadejia - Jama'are - Yobe sub-basin in the north contains the Hadejia and Jama'are rivers, which supply the Hadejia-Nguru wetlands. They converge to form the Yobe, which defines the border between Niger and Nigeria for , flowing into Lake Chad. About of water reaches Lake Chad annually. Construction of upstream dams and growth in irrigation have reduced water flow, and the floodplains are drying up. The Yedseram -
Wildlife of Cameroon Boumba–Bek, the Boumba Bek National Park covering , and the Lobéké National Park covering (integrated with the Trinational Park of Cameroon, the Central African Republic, and the Republic of Congo and linked with an Eco-corridor to Boumba–Bek Reserve; the Campo Ma'an National Park of , which borders with the Rio de Campo of Equatorial Guinea; and the Savanna Zone comprising the Waza National Park of near Chad border, Faro National Park of area with common boundary with Nigeria, and the Kalamaloué National Park of on the Chad border. Cameroon's first protected area in the northern part of the country was