Countries with "Sea Cows"

There are 4 extant species of "sea cows", three manatees and the dugong. Can you name all the countries whose waters provide refuge to these enigmatic and vulnerable aquatic giants? Hint: The Amazonian manatee is almost exclusively resident in freshwater river systems, the African manatee will inhabit coastal areas and river systems while the West Indian manatee and the dugong live exclusively in salt water coastal areas.