Forty miles above the mouth of the Cuiaba the St. Lourenço is joined by the Piquiri, which is larger, has its heads near the boundary of Cayaponia, not far from those of the Sucuriu, and receives on the right the Piaughuhi, which originates in the same parts; on the left, the Itaquira, which has its source in the proximity of that of the Jauri-Guassu, a branch of the Tocoary, already mentioned. A few years only have elapsed since an explorer navigated up the Piquiri seven days, and did not encounter a cataract. Ancient certanistas have asserted that the navigation from Porto Feliz to Cuiaba may be accomplished by the Sucuriu and Piquiri. It is, however, certain that the voyage from the mouth of the Tiete to the Cuiaba is more than one-third shorter than by that of Camapuan. The Rio das Mortes, (River of the Dead,) which took this name in consequence of many people of the first bandeira dying upon its margins from fevers, has its numerous heads to the south of the Cuiaba road. It runs to the north-east and discharges its considerable volume into the western arm of the Araguaya, where it forms the island of St. Anna. It affords extensive navigation into the interior of the province. The Roncador and the great and small Sangradores are the most remote origins of this river. The first is the most western, and flows a short distance from an arm of the aforesaid Sucuriu. Between the two Sangradores there is a spacious lake, called Logoa Grande. The Rio do Peixe, (River of Fish,) formed by the Raizama and Tacoaral, which also cross the Cuiaba road, there insignificant, flows northwards, and ultimately enters the Rio das Mortes. Twenty-five miles from the Araguaya, near a small stream and the said road, is situated the aldeia of Insua, with a register. There existed upon the left margin of the Rio das Mortes, an aldeia, named Amaro Leite after its founder, which disappeared when the road was carried in a more direct line further to the south. _District of_ JURUENNA. This comarca is bounded on the north by Mundrucania, on the west by the rivers Guapore and Madeira, on the south by the comarca of Matto Grosso, and on the east by the river which affords its name, comprising nearly four hundred miles from north to south, and much more from east to west. Between the Pederneiras and Araras falls, in the latitude of 9° 45′, where the river Madeira curves to the west, there is a point on its eastern margin, in front of the mouth of the river Abuna, from which it takes the name, and is the most western land of the Brazil.