Cuyo is the wine-producing, mountainous area of central-west Argentina. It is the home of some of the most popular tourist attractions in Argentina and the highest mountains in the Andes, including Aconcagua itself, the highest peak outside Asia, and the Ischigualasto Provincial Park. The soil is arid and reddish, crossed by few rivers. Most of the rivers are fed by the thawing of snow on the peaks, and their volume of water increases considerably in spring. The cities and towns in the region are characterized by colonial low buildings and narrow streets that, in larger cities, contrast with the more modern areas.