Which of the following is not a GI in Greater Perth?

Margaret River is not classified as a Geographic Indication (GI) within the Greater Perth region. Instead, it is a distinct GI located about 270 kilometers south of Perth and is renowned for its high-quality wines, particularly Cabernet Sauvignon and Chardonnay.

In contrast, the other regions mentioned, such as Peel, Swan Valley, and Perth Hills, are all part of the Greater Perth area. Peel is known for its diverse wine styles and proximity to Perth, Swan Valley is one of Western Australia's oldest wine regions, famous for its rich history and range of wines, and Perth Hills is recognized for its cool-climate varietals thanks to its elevation. Each of these regions contributes to the wine diversity found within the Greater Perth GI boundaries, while Margaret River stands alone as a prominent and separate area known for its own unique wine styles and terroir.