Hidrographical Map of Tucumán
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Tucumán rivers are fed by springs and rains; the latter being heavier in summer. The tributary basins are Calchaquíes summits and the Aconquija range.

Thawing deriving from high peaks has no significant influence on river flows.

The most important is Salí, the biggest collector in the province. It is born in the northern end, in the boundary with the province of Salta under the name of Tala. In its route through Tucumán, it receives the flow of the following tributary rivers: Acequiones, Choromoro, Vipos and Tapia, up to Gdor. Celestino Gelsi reservoir. From there, there is the addition of rivers such as Loro, Calera, Lules, Colorado, Famaillá, Caspichango, Los Sosa, Pueblo Viejo, Seco, Gastona, Chico, Medina, Marapa and a great number of streams until flowing into Río Hondo reservoir, which is the boundary with the province of Santiago del Estero. Its flow runs through the Pampa sierras region, with drainage into an endorheic basin (with an interior outfall). Its waters reach the north of the province of Córdoba, where it forms numerous swamplands, ending in Laguna de los Porongos. In summer, its flow reaches up to Mar Chiquita lagoon. In the province of Santiago del Estero, it is known under the name of Río Dulce.

In general, Tucumán rivers are not navigable.