The Marlborough wine region is by far New Zealand's largest, accounting for three quarters of the country's wine production, 70% of its vineyard area and 85% of its wine exports. A Geographical Indication in the north-east of the South Island, it covers the entire Marlborough Region and the Kaikōura District of the Canterbury region, but in practice the vineyards are concentrated around the Blenheim and Seddon townships. 

Internationally, Marlborough Sauvignon Blanc is recognised as world class; wine writers such as Oz Clarke and George Taber have described it as the best in the world.

Marlborough was established in 2018 as a New Zealand geographical indication (GI) under new legislation. Marlborough also hosts significant production of méthode traditionelle sparkling wine made from Chardonnay and Pinot Noir, sufficient to attract investment from large Champagne producers Mumm, Deutz, Moët & Chandon (which now owns Cloudy Bay) and Veuve Clicquot.

- Wikipedia