Argentine Northwest

The Argentine Northwest (Noroeste Argentino) is a geographic and historical region of Argentina composed of the provinces of Catamarca, Jujuy, La Rioja, Salta, Santiago del Estero and Tucumán.

The Argentine Northwest comprises very distinct biomes, or geographical and climatic regions. From west to east they are:

Besides the Yungas jungle on the eastern fringe of the region, the only fertile lands are those near the river basins, which have been irrigated extensively. Across millennia the erosive forces of these rivers has gradually created a multitude of red-rock canyons, such as the Quebrada de Humahuaca and the Valles Calchaquíes.

West of these valleys the peaks of the Andes reach heights of over 6,000 metres (20,000 ft) and the Altiplano, an extensive 3,500-meter high plateau, dominates the landscape and continues far north into Bolivia and Southern Peru.

Northwest Argentina is predominantly dry and hot and classified as subtropical. Owing to its rugged topography, the region is climatically diverse, depending on the altitude, temperature and distribution of precipitation. Consequentially, the vegetation will differ at these different climate types. In general, the climate can be divided into 2 main types: a cold arid or semi-arid climate at the higher altitudes and warmer subtropical climate in the eastern parts of the region. Under the Köppen climate classification, the region has 5 different climate types which are semi–arid (BS), arid (BW), temperate climate without a dry season and with a dry season (Cf and CW respectively) and an alpine climate at the highest altitudes.

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