Next day I left Salta for a three-day tour to Quebrada de Humahuaca, a canyon that starts in Jujuy, the other major city in this area, and which reaches further north towards the Bolivian boder. The people living here are mainly Quechua indians. The mountains are dry, but in the river valleys, argiculture is possible thanks to irrigation.
I stayed in Tilcara, a small town with 3300 souls, and a popular tourist stop, thanks to its Inca ruins. This picture is from a hill just outside town and on the hill to the right is the ruins. To the left of that hill, you see a green oasis that exists thanks to the water irrigated from the river. The river, or at least the dry river bed, is further back in the picture.