The island appears on this 1644 map as "I St. Pierre"
St Peter Island is an island in the Nuyts Archipelago on the west coast of Eyre Peninsula in South Australia near Ceduna. It is the second largest island in South Australia and about 13 km long. It was one of the first parts of South Australia to be discovered and named by Europeans, along with St Francis Island, mapped by François Thijssen in 't Gulden Zeepaert in 1627.
Protected area status
The island is part of the Nuyts Archipelago Conservation Park while the waters surrounding its shores are in the Nuyts Archipelago Marine Park.
Important Bird Area
The island is part of the Nuyts Archipelago Important Bird Area (IBA), so identified by BirdLife International because it supports over 1% of the world populations of short-tailed shearwaters, white-faced storm-petrels and pied oystercatchers. The island lies across the Yatala Channel from the separate Tourville and Murat Bays Important Bird Area, just west of Ceduna on the mainland.
Coordinates: 32°17′S 133°34′E / 32.283°S 133.567°E