The climate is cool, with a high level of rainfall (51 inches (1300 mm) a year), a short growing season, and high temperature variation between day and night, which is challenging for wine producers. Most vineyards are located around the town of Traiguen, just south of the Bio Bio Valley. The volcanic soil in Malleco, composed mainly of sand and clay, are reasonably well drained. Although the valley has high rainfall, vines have to make extra effort to hydrate due to the well-drained soil, which results in less foliage and lower grape yields. All these factors produce grapes with more concentrated flavour and excellent structure, which in turn leads to the crisp and fresh wine produced in the region.