In Tucuman and eastern Salta the same division into forests and open plains exists, but the former are of denser growth and contain walnut, cedar, laurel, tipa (Machaerium fertile) and quebracho-colorado (Loxopterygium Lorentzii).
The names, area and population of the provinces and territories are as follows: The principal towns, with estimated population for 1905, are as follows: Buenos Aires (1,025,653), Rosario (129,121), La Plata (85,000), Tucuman (55,000), Cordoba (43,000), Sante Fe (33, 200), Mendoza (32,000), Parana.
In the provinces of Tucuman, Salta and Jujuy the main industry is sugar growing and manufacture.
In 1553 an expedition from Peru made their way through the mountain region and founded the city of Santiago del Estero, that of Tucuman in 1565, and that of Cordoba in 1573.
In 1620 Buenos Aires was separated from the authority of the government established at Asuncion, and was made the seat of a government extending over Mendoza, Santa Fe, Entre Rios and Corrientes, but at the same time remained like the government of Paraguay at Asuncion, and that of the province of Tucuman, which had Cordoba as its capital, subject to the authority of the viceroyalty of Peru.