Yamanashi
With Mount Fuji for backdrop, Yamanashi’s 81 wineries account for around 30% of Japanese wine production and just over half of what they produce is Koshu, followed by the hybrids, Muscat Bailey A and Delaware. Grapes are grown on traditional overhead pergolas to maintain air-circulation and protect against the perils of humidity and monsoon rains. European varieties, including Merlot, Cabernet Sauvignon and Chardonnay, account for five percent of production. Grown largely in the Katsunuma area of the prefecture, Koshu covers some 450 of Yamanashi’s 4,350 hectares of wine grapes, and comes in a variety of styles, mainly dry unoaked white, but also oaked, medium, sweet and sparkling.