Dusky Sound is enormous and beautiful. The fjord offers 25 miles of gorgeous scenery and the mouth is five miles wide. Its isolation toward the southern end of Fiordland has created a haven for endemic wildlife and lush vegetation. These are Two Sisters Islands. They are among the 700 islets accenting your cruise through Breaksea Sound, Acheron Passage, Wet Jacket Arm and Dusky Sound. The mountains piercing the clouds peak at 3,744 feet.