Doubtful Sound/Patea is a fiord located in the Fiordland National Park on the southwest coast of New Zealand's South Island. It is the second-largest fiord in the park and is known for its remote and untouched natural beauty.

Doubtful Sound is quite remote and, unlike Milford Sound, cannot be directly accessed by private vehicle. You could access it by boat, floatplane or helicopter, but most visitors would join a tour that includes travel across Lake Manapouri by boat, and then by bus over the Wilmot pass into Doubtful Sound. There are options to take a day cruise, kayak tours, or overnight or multi-day cruises on Doubtful Sound. This remoteness adds to the sense of adventure and isolation that visitors experience when exploring Doubtful Sound.

On your way to Doubtful Sound, you will see the Manapouri Power Station and follow the road over Wilmot Pass that was built to service the Hydro Electric Power scheme. You will see where water is taken from Lake Manapouri and then disappears into the power station before plummeting down to power huge underground turbines. The water then exits down into Deep Cove at Doubtful Sound through two tailrace tunnels that had been bored through the mountains.

Doubtful Sound is surrounded by steep cliffs, dense rainforest, and cascading waterfalls, making it a breathtaking sight to behold. Your boat or kayak tour will allow you to get up close to the waterfalls and wildlife, including dolphins, seals, and penguins.

Doubtful Sound is an excellent destination for those looking for a more remote and off-the-beaten-path experience of New Zealand's natural beauty. It offers a unique and unforgettable experience of the country's wilderness and is a must-visit destination for nature lovers.