Further inland, summers gain a few degrees while winter nights become somewhat colder in the flat southern Pampas. Adding to the variety of climates and soils in the area, there are low mountain areas (generally below 1,000 metres or 3,000 ft.), valleys and rivers. Major wineries (like Trapiche) have made investments in the area and production is likely to increase significantly, but most of the potential in this vast area is untapped.