Songhai
It seems as if the most well known river near Mali is the Niger River. The Niger River runs through Mali, Guinea, Niger and Nigeria.
The Niger River Kingdom is probably the same as the Old Calabar Kingdom located in what is now known as the Niger Delta (the delta of the Niger River in Nigeria).
The Niger river.
The Kingdom of Nri was an early kingdom near the Niger River. This was the state of the Nri-Igbo people of West Africa.
It is located right by the Niger River.
The Niger River.
Africa
The River Niger empties into the Gulf of Guinea :)
In west Africa
Benin
Near the Niger River.
Near the Niger River.