In Central African mythology, a sort of fresh-water mermaid traditionally known to have white skin and African features. They can be met at waterfalls though they actually live in villages elsewhere where they presumably have legs and live in houses and such.
Men desiring a Siren for a wife would have to make arrangements with her mother and provide a large dowry or bride-price.
Legend in Ngouha2, Congo tells that a man from there once tricked a Siren into letting him marry her daughter by use of magic. When the mother shook off the spell, she sent torrents of rain to wash out the village. The villagers forced the man to flee and the rain subsided. The man was seen years later without his wife and refused to speak of the events.
The portrayal of Sirens as white-skinned reportedly predates the arrival of Europeans.