Eight miles lower, in the latitude of 21°, upon the western margin, is the morro which the ancient Paulistas called the Mount of Miguel Joze, upon whose skirt is situated Fort Bourbon. Twenty-five miles by water, to the south of the mount of Miguel Joze, in the latitude 21° 20´, a chain of small mountains prolong themselves with the Paraguay, where its waters are contracted into a narrower space, flowing rapidly in two channels, separated by a rocky island of considerable length. In this situation, denominated the Fecho dos Morros, (the Barricado of Rocks,) and which is the limit between the High and Low Paraguay, terminate the laky and swampy margins of this majestic river, which commence, as has been previously noticed, at Escalvada Point, near three hundred and fifty miles to the north. The width of the river within this space, during the inundations, which begin in April and continue till September, is from seventy to one hundred and fifty miles, and forms an internal sea, which the ancient Vincentistas denominated the Sea or Lake Xarays, from a nation so called, now not existing, or, at least, not known by such an appellation. At the time of these awful floods, a great part of the beds of the rivers of St. Lourenço, Tocoary, Mondego, and others on the eastern side, as well as the aforesaid lakes on the western, and the adjacent woods, become portions of this periodical Caspian, where the elevated lands assume the appearance of islands, inhabited by an accumulation of birds and wild animals. At the said Fecho, both margins of the Paraguay begin to acquire a solid terra firma, particularly the eastern. By this bank are discharged the small Tipoty, the Correntes, the Rio Branco, (which appears to be the said Correntes,) the Appa, (which is thought to be the Pirahy of the ancient Paulistas,) the Guidava, the Ippanne Guassu, the Ippanne Mirim, and the Chichuhi, where the rugged margin called Huguruguita commences, and is prolonged for the space of thirty-five miles to the mouth of the small Suobogo, where begins the bank or coast of Pataque, of short extent, terminating at the embouchure of the Tabixu, which, as well as the preceding, enters the Paraguay on the left. In the latitude of 25° 22´ is situated the city of Assumption; and eighteen miles to the south of it, the first arm of the large river Pilco Mayo is discovered, which originates in the cordillera of the Andes, in the district of Potoze, whither it affords navigation. Forty miles lower down is the mouth of the second arm, and fifteen further, the most southern arm. The course of the Pilco Mayo is not much less than seven hundred miles. On the eastern margin, the Piraju, the Cannabe, and the Tibicoary enter the Paraguay. In the latitude of 26° 50´, the Rio Verde, or Parsa, otherwise Colorado, discharges itself, after a course of more than seven hundred miles from the vicinity of the Andes.