St Peter's Cathedral is an Anglican cathedral in the South Australian capital of Adelaide. It is the seat of the Archbishop of Adelaide and Metropolitan of the Province of South Australia. The cathedral, a significant Adelaide landmark, is situated on approximately 1 acre of land at the corner of Pennington Terrace and King William Road in the suburb o…St Peter's Cathedral is an Anglican cathedral in the South Australian capital of Adelaide. It is the seat of the Archbishop of Adelaide and Metropolitan of the Province of South Australia. The cathedral, a significant Adelaide landmark, is situated on approximately 1 acre of land at the corner of Pennington Terrace and King William Road in the suburb of North Adelaide.