Received this cover back from McMurdo station today. This American base is located at 77° 51′ 0″ S, 166° 40′ 0″ E (south of New Zealand) on the southern tip of Ross Island on the shore of McMurdo Sound. It is the largest base in the Antarctic and can support over 1200 residents.
The mailing address I used to get my cover to the post office at the base was “McMurdo Station Post Office, PSC 469 Box 700, APO AP 96599-1035”. Because this was an APO the postal rates to and from Canada were the same as they would be mailing to and from the continental US.
Photo Credit: Gaelen Marsden and Wikipedia