At its highest part, its main tributaries are the Lipeo River, and further downstream the Grande de Tarija, the Iruya River, and the San Francisco River.
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The Teuco follows its course to finality and into the Paraguay River, in front of the city of Pilar, in Paraguay.
Following this, Lieutenant Page commanded the USS Water Witch in which he explored the Argentine rivers Paraguay and Bermejo in the late 1850s, making the first detailed hydrological studies of the Rio de la Plata.
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