The turquoise waters of Lagoa Azul in northern Sao Tome, Sao Tome and Principe, Atlantic Ocean, Africa

Miradouro da Grota do Inferno viewpoint over Sete Cidades and Lagoa Azul covered by low clouds, Sao Miguel Island, Azores Islands, Portugal, Atlantic, Europe

Miradouro da Grota do Inferno viewpoint over Sete Cidades and Lagoa Azul covered by low clouds, Sao Miguel Island, Azores Islands, Portugal, Atlantic, Europe

Miradouro do Cerrado das Freiras viewpoint on the huge volcanic crater that is now Lagoa Azul on Sao Miguel island, Azores Islands, Portugal, Atlantic, Europe

Miradouro do Cerrado das Freiras viewpoint on the huge volcanic crater that is now Lagoa Azul on Sao Miguel island, Azores Islands, Portugal, Atlantic, Europe

Miradouro do Cerrado das Freiras viewpoint over Lagoa Azul in Sete Cidades, Sao Miguel island, Azores Islands, Portugal, Atlantic, Europe

Lagoa Azul (Blue lagoon) and sandy dunes at Parque Nacional dos Lencois Maranhenses, Brazil, South America

Lagoa Azul (Blue Lagoon) and sand dunes, Parque Nacional dos Lencois Maranhenses, Brazil, South America

Lagoa Azul (Blue lagoon) and sand dunes, Parque Nacional dos Lencois Maranhenses, Brazil, South America

Lagoa do Canario and Lagoa Azul, Caldeira das Sete Cidades, Sao Miguel, Azores, Portugal, Europe

Man swimming in Lagoa Azul (Blue Lagoon) in Ilha Grande, Rio de Janeiro, Brazil