It is bounded by the province of Santiago del Estero to the north, and Santa Fé to the east, and on the western side by the mountain-ranges generally known as the Sierra de Cordova. From these ranges descend many rivers and streams which irrigate and fertilise the plains below; amongst which may be enumerated the Rio San Miguel, the Tortoral, the Carnero, the Primero, Segundo, Tercero, Quarto, and Quinto: of these the Tercero is the only one which reaches the Paranã; all the rest are lost in the flat intervening plains. It has been ascertained that very little is requisite to render the Tercero navigable for boats from the Paranã to within about thirty leagues of the city, whereby a water communication might be opened, which would save much of the present expensive and tedious land carriage of the productions not only of Cordova, but of the provinces of Cuyo, to Buenos Ayres. The perpetual irrigation of so many streams gives rise to a constant supply of excellent pasturage for cattle and sheep, the facility of rearing which may in some measure account for the preference evinced by the people for pastoral over agricultural pursuits. These habits occasion the country population to be much scattered: they congregate but little in the towns; and the principal places after the capital, Conception, Ranchos, and Carlotta, are at the best but wretched villages. In travelling from Buenos Ayres after passing the post of Frayle Muerto on the river Tercero, the aspect of the country begins to change: it becomes undulated, and at last there is an end of the monotonous scenery of the Pampas, throughout which not a tree is to be seen save the solitary Umbú, standing like a giant land-mark in the boundless plain. The traveler's eye is relieved by the appearance of woods and forests which become more dense as the Sierra is approached. The trees are for the most part varieties of the mimosa family, thickly set with thorns; and so marked is this peculiarity in those parts, that I recollect a gentleman from Cordova who came to Buenos Ayres whilst I was there, expressing something more than common surprise at finding that the greater part of the trees which grew in the gardens about the city, and which were probably chiefly of European origin, were not covered with thorns like those of his own province. The palm-tree is scattered over the valleys in the northern part of the province, and on the road to Santiago del Estero; and it is the land of the aloe and cactus in every variety. The city which gives its name to the province was founded by the conquerors of Tucuman in 1573; it is situated in lat. 31° 26´ 14",[59] long. from Ferro, 314° 36´ 45", in a pleasant valley upon the banks of the river Primero, sheltered from the north and south winds, which, in the more exposed parts of the province blowing alternately hot and cold, produce great and sudden variations in the atmosphere, very trying to the constitutions of the inhabitants.