The island is situated within the Ketchikan Gateway Borough and is part of the Alexander Archipelago.
The village of Pennock is located near Whiskey Cove, across from the Coast Guard Station Ketchikan.
[2] The ancestral tribal burial ground of the Taan ta Kwaan and the Sanyaa Kwáan are located on Pennock Island.
[9] Pennock Island first appeared on the 1940 United States census as an unincorporated settlement.
The race course covers a distance of 8.2 miles (13.2 km) in a circular pattern around the rugged island.