Explore Doubtful Sound from Manapouri on a scenic boat tour. The area is rich in flora and fauna and home to a variety of wildlife including NZ Fur Seals, Fiordland Crested Penguins and Dolphins. Doubtful Sound is the deepest of the fiords at 421 metres deep and is over 40km to the ocean. Fewer boats travel on the waters of Doubtful Sound, compared with Milford Sound, creating a peaceful and intimate experience. The fiord is accessible via Manapouri with a brief boat ride over Lake Manapouri, with the Doubtful Sound Wilderness Day Cruises also offering transfers from Te Anau and Queenstown. A popular way to experience Doubtful Sound is by overnight cruise on board The Navigator.