This line has been twice modified by treaties between Bolivia and Brazil, but without the consent of Peru, which claimed all the territory eastward to the Madeira between the above-mentioned line and the Beni-Madidi rivers, the line of demarcation following the Pablo-bamba, a small tributary of the Madidi, to its source, and thence in a straight line to the village of Conima, on Lake Titicaca.
West of the Cordillera Oriental, where special conditions prevail, a great desert plateau stretches entirely across one corner of the republic. Apart from the Andean system there is a group of low, broken, gneiss ranges stretching along the east side of Bolivia among the upper affluents of the Mamore and Guapore, which appear to belong to the older Brazilian orographic system, from which they have been separated by the erosive action of water.
Mount Aguita is 20,600 ft., and the Bolivia culminating peak of those of Tres Cruces reaches 22,658 ft.
It is largely consumed in Bolivia and Matto Grosso, where it is used in the preparation of a beverage which has excellent medicinal properties.
Cinchona Calisaya has also been cultivated extensively in Bolivia and in Tolima, United States of Columbia.
His project of a constitution for Bolivia was presented to the congress of that state on the 25th of May 1826, accompanied with an address, in which he embodied his opinions respecting the form of government which he conceived most expedient for the newly established republics.
At the southern frontier of Bolivia the main chain, which has served as the boundary line between Argentina and Chile, divides into two great ranges, the principal one continuing almost due north along the eastern side of the great Bolivian alto-planicie, and the other forming its western rim, where it is known as the Cordillera Silillica, and then following the trend of the coast north-westward into Peru becomes the Cordillera Occidental.
Egusquiza (1894-1898) the boundary dispute with Bolivia became acute; but war was averted, largely owing to the success of the revolution, which forced the president to resign.
In Bolivia this eastern ridge, separated from the western Cordillera by the longitudinal valley in which Lake Titicaca lies, is formed chiefly of Archaean and Palaeozoic rocks.
In southern Bolivia Cambrian and Ordovician beds form the greater part of the eastern Andes, but farther north the, Devonian and Carboniferous are extensively developed, especially in the northeastern ranges.