What is located south of the mouth of the Congo River or its source?

If you look at the map, you can see that the mouth of the Congo River is farther north than its source. Both are located south of the equator, but some of the Congo’s tributaries originate in the Northern Hemisphere. For example Ubangi. If we take them into account, then the mouth, located on the coast of the Atlantic Ocean, will be located approximately in the central part of the river basin. The source and upper part of the Congo are called Lualaba, and some local tribes also call the entire river Zaire.

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