San Martin is a sub-region in the Mendoza wine region of Argentina. It is located 25 miles (40km) to the east of the city of Mendoza, and just to the north of the Tunuyan River. Until recently, San Martin concentrated on the production of Criolla Grande and Cereza, but it is now moving towards international grape varieties in order to benefit from the Mendoza region's success in exporting wine.
San Martin is not as high-altitude as the nearby wine regions of Maipu and Lujan de Cuyo, and vineyards reach only as high as 2300ft (700m) above sea level. As a result, the viticultural estates of San Martin have a slightly warmer climate with a less-pronounced diurnal temperature variation, meaning that the wines are slightly fuller and riper than the balanced, aromatic styles of Malbec and Cabernet Sauvignon that are most commonly associated with Mendoza.
The region centers around the town of San Martin, named for Jose de San Martin, an Argentine general who fought for South America's independence from Spain.