Umbria is one of Italy's few landlocked provinces, featuring a rich history and rustic countryside. While the terrain is very similar to Tuscany to the north, the climate is somewhat hotter, since it is without the coastal influence. Many of the grapes grown in Tuscany flourish in Umbria, with Sangiovese, Grechetto, and Trebbiano thriving. Sagrantino being the region's truly singular contribution. Montefalco is the heart of Umbria's wine production with a Montefalco Rosso DOC (A blend of Sangiovese and Sagrantino,) and Sagrantino di Montefalco DOCG (100% Sagrantino). Sagrantino was produced as a sweet passito style wine for centuries, and by 1960 had nearly disappeared. The Sagrantino grape is thick skinned and creates a meaty, tannic red wine that requires years of aging. The second DOCG in Umbria is Torgiano Rosso Riserva, which must be aged for at least three years, and contains at least 70% sangiovese, with Cannaiolo and other local grapes allowed. White wines dominate the volume of production in Umbria. Grechetto and Trebbiano are usually blended as part of the Orvieto DOC, which is the largest category by volume in the region. Orvieto is well regarded by critics as a distinctive, Italian white, and Sagrantino, despite its smaller plantings, is considered one of the great undiscovered red wines of the world.