Sea of Cortez, gulf of California, USA

With the Colorado river in the north to the Baja peninsula in the south, the sea of Cortez is relatively large and is scattered with around 240 islands.  While there is some wildlife to be explored on some of the islands, the seas are also teeming with a wide variety of species. On the surface blue fin humpback and sperm whales can be seen, alongside bottlenose dolphins Guadeloupe fur seals and leaping Mobula rays. There are also a wide variety of sea birds. As well as all this that can be seen from a boat, there is also a large number of coral reefs, meaning it is hugely popular with snorkellers and divers as well.