MOXOS or MOJOS is an extensive territory bounded by the Portuguese government of Matto Grosso on the east, Cuzco and the Peruvian provinces on the west, and Chiquitos and Santa Cruz on the south. It extends on each side of the Mamore, and is chiefly inhabited by warlike and wandering tribes of Indians, who forbid access to its interior. This country contains the lake _Rogagualo_, a large body of water of an oval figure, formed by an arm of the _Rio Beni_, which rises near La Paz on the west side of the Andes, in 18° south latitude, and flowing north, enters the Ucayale, their united streams joining the Apurimac. The banks of the Beni have many settlements of the missionaries. This lake empties itself into the Mamore by a channel called _De la Exaltacion_, thus forming an immense island of the country lying between the Maranon on the north, the Madera and Mamore on the east, and the Beni and Ucayale on the west. From lake Rogagualo three other rivers take their rise and flow into the Amazons on the north; _viz._ the _Jutay_, the _Juruay_ and the _Puros_. There are several missionary villages in the province of Moxos: but the country is still under the power of the aborigines. CHACOS is another large territory, bounded by Chiquitos on the north; Paraguay on the east; the great plains of Manos on the south; and Tucuman and Tarija on the west. It is of immense extent, and chiefly inhabited by tribes of wandering Indians, having on its east the great chain of mountains on the banks of the Paraguay, and contains the great _Rio Pilcomayo_, which flows into the Paraguay near Asuncion. The Jesuits made several attempts to colonise Chaco, but did not succeed, and little is known concerning its products or features. The adjoining government to Los Charcas, which has now been described as fully as the nature of the work would admit, is,-- _THE GOVERNMENT OF PARAGUAY._ Paraguay is a very extensive government of Buenos Ayres, which is bounded by Chiquitos, Chacos, and Tucuman on the north-west and west; on the north it extends to Lake Xarayes; north-east and east it bounds the Portuguese territories; and south-east and south it is limited by the Parana, which separates it from the missions of Guayra in Buenos Ayres, its jurisdiction ending in the south of the city of Asuncion, in 26° 48' south latitude, and it is divided from Tucuman, or the Llanos de Manso, by the river Paraguay. HISTORY, DISCOVERY, &c.