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The correct answer is Canterbury, as it is a prominent wine-producing region located in the South Island of New Zealand, specifically surrounding the city of Christchurch. This region has gained recognition for its quality Riesling and Pinot Noir, benefiting from a unique climate and diverse soils that contribute to the expression of these varietals.

Canterbury experiences a cool maritime climate, which is ideal for growing aromatic grapes like Riesling, known for its purity and vibrant acidity. Additionally, Pinot Noir thrives in this region, supported by various microclimates that allow for the development of complex flavors and aromas in the wine.

While the other options, such as Otago, Marlborough, and Nelson, are also well-known wine regions in New Zealand, they have distinct characteristics and are recognized for different varietals or styles. Otago, especially Central Otago, is famous for its high-quality Pinot Noir, while Marlborough is renowned for its Sauvignon Blanc. Nelson is known for its diverse range of wines, including aromatic whites. However, for quality Riesling and Pinot Noir specifically in proximity to Christchurch, Canterbury stands out as the answer.