An image of Doubtful Sound from someone else’s travel log:
http://www.travelblog.org/Photos/15531.html

Fiords (from the Wikipedia – includes image of Doubtful Sound as an illustration)
http://en.wikipedia.org/wiki/Fjord

Doubtful Sound is the fiord at the far left upper edge of this map, accessible only by busride from Te Anau, then boat over Lake Manapouri, then another bus ride over an incredible pass on a gravel road subject to dozens of waterfalls which appear whenever the rains fall…