Winemaking in the northern part of Valencia region - spelled València in the local language, and also known by Spaniards as the Levante or País Valenciano - is dominated by old growing areas around Valencia, Spain's third largest city. Their reds, rosés and whites include famed dessert wines from a variety of grapes grown in four distinct subzones. Each has its own wine-making traditions. Thanks to centuries of export through the city's port, production here is more strongly focussed on markets outside Spain than those at home, which has worked as an impetus to keep quality high throughout the 20th century. A formalised arrangement allows Valencia DO bodegas to buy in wine from neighbouring Utiel-Requena, as needed for each vintage, and permits laboratory methods allowing the wines to be tracked in the bottle.