Zona simply means "region" or "zone" , so there would probably have been a name of the area that the wine came from following that on the label - can't help beyond that, but if you like Chilean / Argentinian Cabernet, try Casillero del Diablo (widely available and very good, �5 - �6 a bottle), or if you want to splash out a bit, the Montes Alpha range are very good (c. �10 a bottle, still fairly widely available) and Clos de la Siete is exceptionally good (�10 in majestic, not sure where else sells it)