San Antonio, which includes the now-famous Leyda zone, is one of the one of Chile's smallest viticultural areas. With vineyards as close as 4 km (2.5 mi) from the sea, it is also the most maritime region. The exploration for new terroir suggested that this area would be suitable for cool-weather varieties, such as Sauvignon Blanc, Chardonnay, and Pinot Noir, and the results are more than encouraging. Cooler temperatures mean longer ripening periods and crisper acidity for leaner, more food-friendly wines. Some producers have experimented with other red varieties such as Syrah, which is normally planted in warmer zones such as Aconcagua and Colchagua. The result is a cool-climate Syrah that is causing many to re-think the concept of Chilean Syrah. Irrigation is clearly a concern here, and it is a prevailing factor in determining how much of the area can or will be planted. One determined producer constructed an 8-km aqueduct to feed his drip-lines.