Great Barrier Reef, Queensland, Australia by Scott Sporleder. The Great Barrier Reef is the world's largest organically formed structure. I have also been here at the Great Barrier Reef truly a wonder to see. Luv Australia been there twice.
Lake Retba also known as Lac Rose meaning Pink Lake, lies north of the Cap Vert peninsula of Senegal. Named for its pink waters caused by Dunaliella salina algae and is known for its high salt content, up to in some areas.