Trentino forms the southern half of the former Austrian Tridentine Tyrol, its vineyards spreading along the Adige valley from the Dolomites toward Lake Garda. It is the largest of the nine Alpine wine regions, producing mostly white wine under a structure dominated by cooperatives, with the traditional pergola training system still common across much of the valley floor. Soils range from the deep alluvial gravel of the Rotaliana Plain, home to the indigenous Teroldego, to the porphyry and granite of the Cembra Valley, where Müller-Thurgau and Pinot Nero take on unusual tension at altitude. TrentoDOC, made across the region from Chardonnay and Pinot Nero, is one of Italy's most respected traditional-method sparkling wine categories.