Petrus is easily Pomerol's most important wine, and is one of the most notable estates in Bordeaux. The Merlot-based wine comes from an 11.4-hectare (28-acre) vineyard in the eastern part of the Pomerol appellation, and is known for being rich and powerful, with characteristics of chocolate, spice and black fruit. Petrus is one of the world's most collectable and expensive wines.