In which direction does the Tigris river flow?

What major river system in Africa flows north, then changes direction to flow southeast, and changes direction again to flow south into the Gulf of Guinea

• Answer:

  Among the many rivers that drain into the Gulf of Guinea are the Niger and the Volta. The upper Niger, from the source past the trading city of Timbuktu to the bend in the current river, once emptied into a now-gone lake, while the lower Niger started in hills near that lake and flowed south into the Gulf of Guinea.