San Antonio (Chile), Buenaventura (Colombia), Itajaí (Brazil), Valparaíso (Chile), Montevideo (Uruguay), Paranaguá (Brazil), Rio Grande (Brazil), São Francisco do Sul (Brazil), Manaus (Brazil) and Coronel (Chile). The Brazilian railway network has an extension of about 30,000 kilometers. It's basically used for transporting ores. The Argentine rail network, with 47,000 km of tracks, was one of the largest in the world and continues to be the most extensive in Latin America. It came to have about 100,000 km of rails, but the lifting of tracks and the emphasis placed on motor transport gradually reduced it. It has four different trails and international connections with Paraguay, Bolivia, Chile, Brazil and Uruguay. Chile has almost 7,000 km of railways, with connections to Argentina, Bolivia and Peru. Colombia has only about 3,500 km of railways. Among the main Brazilian waterways, two stand out: Hidrovia Tietê-Paraná (which has a length of 2,400 km, 1,600 on the Paraná River and 800 km on the Tietê River, draining agricultural production from the states of Mato Grosso, Mato Grosso do Sul, Goiás and part of Rondônia, Tocantins and Minas Gerais) and Hidrovia do Solimões-Amazonas (it has two sections: Solimões, which extends from Tabatinga to Manaus, with approximately 1600 km, and Amazonas, which extends from Manaus to Belém, with 1650 km. Almost entirely passenger transport from the Amazon plain is done by this waterway, in addition to practically all cargo transportation that is directed to the major regional centers of Belém and Manaus). In Brazil, this transport is still underused: the most important waterway stretches, from an economic point of view, are found in the Southeast and South of the country. Its full use still depends on the construction of locks, major dredging works and, mainly, of ports that allow intermodal integration. In Argentina, the waterway network is made up of the La Plata, Paraná, Paraguay and Uruguay rivers. The main river ports are Zárate and Campana. The port of Buenos Aires is historically the first in individual importance, but the area known as Up-River, which stretches along 67 km of the Santa Fé portion of the Paraná River, brings together 17 ports that concentrate 50% of the total exports of the country. Only two railroads are continental: the Transandina, which connects Buenos Aires, in Argentina to Valparaíso, in Chile, and the Brazil–Bolivia Railroad, which makes it the connection between the port of Santos in Brazil and the city