Regional Bordeaux AOCs surface. Maximum authorized yield is 55 hectolitres per hectare. The authorized grape varieties are the same as red Bordeaux AOC although Merlot is the most common of this AOC. Production requirements and statistics for the various regional AOCs are as follows: Regional Bordeaux AOCs In the Bordeaux wine region there are seven regional "Appellations d'origine contrôlée" (AOCs) that may be used throughout the Gironde department. These are Bordeaux Rouge AOC, Bordeaux Supérieur Rouge, Bordeaux Clairet, Bordeaux Rosé, Bordeaux Blanc, a dry white, Bordeaux Supérieur Blanc, a sweet white, and "Crémant de Bordeaux", a sparkling méthode traditionnelle wine. The regional appellations
Margaret River (wine region) with only 200 millimetres of the annual 1160 millimetres falling between October and April. The low diurnal and seasonal temperature range means an unusually even accumulation of warmth. Overall the climate is similar to that of Bordeaux in a dry vintage. Although the region produces just three percent of total Australian grape production, it produces over 20 percent of Australia's premium wine market. The principal grape varieties are fairly evenly split between red and white; Cabernet Sauvignon, Chardonnay, Sauvignon blanc, Sémillon, Shiraz, Merlot, Chenin blanc and Verdelho. There are no official Margaret River subregions, although in 1999 viticultural scientist Dr