Diving Fiordland, New Zealand
Glaciation carved deep valleys into the hard granite mountains as the ice inched down to the ocean. Today these valleys are flooded arms of the ocean reaching far inland.
Above water, the valley walls are home to transient life-cycles of plant life, from algae to ancient trees.
After nourishing the mountain-side rain forests, the very heavy rainfall flows down unnumbered waterfalls to feed a vast cold fresh-water layer of protection over the warmer sea.