National Geographic Documentary - Lions Ruthless - Nat Geo wildbr These aren't the Crocs you want on your feet.br br This is the story of an incredible place where predators thrive, in particular, where the apex predators of the river meet the most powerful predators of the ocean. Kosi Bay is a beautiful estuarine system in Southern Africa. Predators of all sizes lurk throughout these varied habitats and the greatest of them all come face to face where the fresh waters of the lakes meet the sea, the crocodile and the Zambezi or bull shark.