Moira Sound is a branching inlet on the east side of the southern end of Prince of Wales Island in U.S. state of Alaska.
Moira Sound penetrates Prince of Wales Island about 6 miles (9.7 km) to the southwest, then turns sharply to the northwest for 6–8 miles (9.7–12.9 km), heading near the heads of Cholmondeley Sound, which comes from north-northeast, and Tliakak Bay, which comes from the southwest from Cordova Bay.
The land in the neighborhood of Moira Sound is high and rather steep towards Clarence Strait; but north of Wedge Island, (in latitude 55° 07’) the straight and compact shores are moderately elevated, and the interior country is composed of lofty though uneven mountains, with a forest of pine trees from the water side nearly to their summits.
[4] In 1914, prospecting in the vicinity of Moira Sound amounted to little more than the annual assessment work required by law.
Between the head of Moira North Arm and Mineral Lake the copper mines, once active, were idle throughout the year and the only person in the region was a man who looked after the various properties and as opportunity offered did a little prospecting.