Vieux Château Certan is a wine estate in the Pomerol appellation on Bordeaux’s right bank, known for its rich, deeply colored Merlot-based wine.The vineyard covers 14 hectares (35 acres) in a single block, and neighbors Pétrus in the heart of the Pomerol plateau. It is located on the famed Gunz gravel terrace, which is made up of large pebbles and clay over an iron-rich subsoil. This is quite fertile, so care must be taken to limit vine vigor in favor of ripening grapes. Merlot makes up 60 percent of plantings, with 30 percent Cabernet Franc, which is judged to perform particularly well here. The remainder is planted to Cabernet Sauvignon.