Tamatea / Dusky Sound is a fiord on the southwest corner of New Zealand, in Fiordland National Park. Geography { "type": "ExternalData", "service": "geoshape", "ids": "Q1048789", "properties": { "fill": "#0050d0"}} One of the most complex of the many fiords on this coast, it is also the largest at 40 kilometres in length and eight kilometres wide at its widest point. To the north of its mouth is the large Resolution Island, whose Five Fingers Peninsula shelters the mouth of the sound from the northwest; along the east coast of the island, Acheron Passage connects Dusky Sound with Breaksea Sound, to the north. Several large islands lie in the sound, notably Anchor Island, Long Island, and Cooper Island. The upper reaches of the sound are steep-sided, and the high precipitation of the region leads to hundreds of waterfalls cascading into the sound during the rainy season. Seals and dolphins are often sighted in the sound's waters and occasionally visited by whales where the area especially nearby Preservation Inlet was one of earliest shore-based whaling ground for southern right whales, while humpback whales show sudden increases. The Seaforth River is the largest of many small rivers and creeks which flow into the sound. At its mouth, the sound is wide, and is bordered by the Five Fingers Peninsula to the north and by South Cape and Fannin Bay in the south. The south Island's westernmost point, West Cape lies less than 10 kilometres south of the sound's mouth. Immediately inside the sound's mouth lies the large Anchor Island and numerous small islets, among them the Seal, Petrel, and Many Island groups. To the north of Anchor Island lies Resolution Island, and here its coast in indented by a large triangular cove which separates the Five Fingers Peninsula from the rest of the island. A number of small coves punctuate this coast, including Goose Cove and Earshell Cove. Immediately to the southeast of Anchor Island lies the smaller Indian Island. To the east of Anchor Island, the sound narrows to about five kilometres and splits into two broad channels, separated by the aptly named Long Island, which stretches for some 15 kilometres in length but is only around 2000 metres wide at its widest point. The narrower of the two channels, Cook Channel, lies to the south of Long Island; Bowen Channel lies to the north. Bowen Channel links with Acheron Passage, a