The general slope of the plateau is toward the N., and the drainage of the state is chiefly through the above-named rivers - the principal tributaries of the Araguaya being the Grande and Vermelho, and of the Upper Tocantins, the Manoel Alves Grande, Somno, Paranan and Maranhao.
Among the conspirators was one Jose Alves Maciel, who had just returned from France where he had met Thomas Jefferson and had become infected with French revolutionary ideas.
Before this decision was given Senhor Rodrigues Alves had been elected president in 1902.
Negotiations were set on foot, and finally by treating the matter in a give-and-take spirit a settlement was reached and a treaty for an amicable exchange of territories in the district in question, accompanied by a pecuniary indemnity, was signed by President Alves at Petropolis on the 17th of November 1903.
It was undertaken in 1903, during the administration of President Rodrigues Alves, as part of a vast scheme to improve the sanitary and traffic conditions of the city, including the construction of a new shore-line and filling in the shallow parts of the shore, which had long been considered one of the prime causes of the unhealthy state of the city.