The only features which seem worthy of remark along the road are the numerous lakes, which appear to be the collections of the streams from the western ramifications of the Sierra Ventana; the most considerable of which is the Laguna del Monte, in lat. 36° 53´, long. from Buenos Ayres 3° 57´; its name, the Lake of the Wood, is taken from a large island upon it covered with fine timber; it is formed by the river Guamini, and other streams from the mountain group so called; its width was estimated to be three or four leagues, and in the rainy season it forms one with the lakes of Paraguayos, extending more than seven leagues to the south-west. Although, the Laguna del Monte was salt, it was observed that the waters of some of the smaller lakes in its immediate vicinity were perfectly sweet. The same observation was made at the Salinas; the sweetest water was abundant in the immediate vicinity of the Great Salt Lake. Shortly before reaching the lake of Paraguayos, the Sierra de la Ventana and its ramification, the Guamini, were seen and particularly observed: the Sierra Guamini bore south 15° east, and the Ventana south-east a quarter east. There they were met by several of the best-disposed of the Caciques and their followers, who supplied them with cattle in exchange for the articles they had with them. They accompanied them to the Salinas, which they reached two days afterwards; and to them they owed their protection from the hostile Renqueles and Carripilum, whose treachery they discovered and exposed.