Manatees

The only manatee species found in the Old World is the West African manatee.

An excerpt from the article 16 facts about manatees

It inhabits the widest range of habitats of all manatee species. It can be found in areas ranging from coastal islands in the Atlantic to rivers in the western Sahel (the geographic area along the southern edge of the Sahara), rivers in the rainforest, etc.

West African manatees have been found as far as 75 kilometers offshore, where there are shallow coastal plains and calm mangrove streams, covered with sea grass.