Foreign relations of Niger about 19,400 km² in northern Niger. There have been several decades of unresolved discussions regarding the delimitation of international boundaries in the vicinity of Lake Chad between Niger, Nigeria, Chad, and Cameroon. The lack of firm borders, as well as the receding of the lake in the 20th century led to border incidents between Cameroon and Chad in the past. An agreement has been completed and awaits ratification by Cameroon, Chad, Niger, and Nigeria. Niger has an ongoing conflict with Benin over Lété Island, an island in the River Niger approx. 16 kilometres long and 4 kilometres wide, located around
Nigeria (), Niger (), Chad (), Cameroon (), and has a coastline of at least s. Nigeria lies between latitudes 4° and 14°N, and longitudes 2° and 15°E. The highest point in Nigeria is Chappal Waddi at . The main rivers are the Niger and the Benue, which converge and empty into the Niger Delta. This is one of the world's largest river deltas, and the location of a large area of Central African mangroves. Nigeria has a varied landscape. The far south is defined by its tropical rainforest climate, where annual rainfall is a year. In the southeast stands the