=Jujuy= in the northwest corner naturally has on the north Bolivia, which comes down a little on the west, where it is followed by a bit of Chile, then by the Argentine Territory of Los Andes. The last is also on the south with a longer stretch of the Province of Salta, which extends along the entire east border as well. Here in Jujuy we are again among the mountains, for three ranges come from Bolivia, passing on through Salta at the south. The _puna_ at the northwest is nearly 12,000 feet high; on this arid plateau are two salt lakes. The mountains reach an altitude of 15,000-20,000 feet. There are low valleys too, where there is mixed farming, not many cattle. Above are the wild vicuñas, guanacos, and chinchillas, as in Bolivia, and various minerals including gold, silver, petroleum, etc., not much worked. Sugar refining and wine making are important. The capital, Jujuy, is in a rich and picturesque valley as low as 3675 feet, from which the railway climbs rapidly to La Quiaca, on the border of Bolivia. =Salta= extends along the southern border of Bolivia from Jujuy to Formosa and Gran Chaco on the east; on the south are Santiago, Tucumán, and Catamarca; on the west Los Andes with Jujuy. The north and west sections are mountainous and cold, with high table-lands and fertile valleys; in the east the terrain comes down to the tropical country, where in places there are forests though some sections are hot and dry. Temperate and tropical products are found here; in the mountains are many varieties of minerals. Cattle are raised, some being driven over the mountains into Chile; hence the proposed railway to Antofagasta. Salta, the capital, with an agreeable climate, is a considerable town, important as a railway centre and with trade of various kinds. =Los Andes=, a Territory at the west, is a bleak mountain region, once belonging to Chile, and a part of the Puna de Atacama. It is but slightly explored, dry and sandy, with salt marshes; it appears to be rich in minerals. San Antonio, the capital, is a place of small importance not on a railway. =Formosa= and Gran Chaco, Territories east of Salta, are precisely opposite to Los Andes in character. Formosa has Bolivia on the northwest; on the long northeast boundary the Pilcomayo River separates it from Paraguay, which is also at the southeast, there separated by the Paraguay River. On the southwest the Bermejo divides it from the Chaco, while Salta is west.