Overview
The Tercero River (Spanish: Río Tercero) is a watercourse situated in the central region of Argentina, flowing entirely within the province of Córdoba. It forms part of the Paraná River basin, ultimately contributing its waters to the Carcarañá River, which joins the Paraná River downstream.
Geography
| Aspect | Details |
|---|---|
| Country | Argentina |
| Province | Córdoba |
| Source | The river’s headwaters arise in the Sierras de Córdoba, a low mountain range that runs north‑south through the province. |
| Course | From its source, the Tercero flows generally east‑northeast, traversing agricultural valleys and several municipalities. Notable settlements along its banks include the city of Río Tercero (named after the river), Villa del Rosario, and other smaller towns. |
| Mouth | It joins the Carcarañá River near the town of Carcarañá, where its waters become part of the larger Paraná drainage system. |
| Length | Approximately 300 km (estimates vary between 280 km and 350 km). |
| Basin size | The river drains a catchment area of roughly 12,000 km² within Córdoba Province. |
Hydrology
The Tercero exhibits a seasonal flow regime typical of the humid subtropical climate of central Argentina. Peak discharges occur during the spring and early summer months (October–December), coinciding with regional rainfall. The river’s flow is regulated in part by small dams and weirs used for irrigation and municipal water supply.
Economic and Social Use
- Irrigation – The Tercero Valley is an important agricultural zone; its waters are diverted through canals to irrigate crops such as soybeans, corn, and wheat.
- Municipal supply – Several towns utilize the river as a source of domestic water after appropriate treatment.
- Recreation – Sections of the river are used for fishing, boating, and limited tourism, particularly near the city of Río Tercero.
Environmental Considerations
- Pollution incidents – In 1995 a chemical plant explosion in the city of Río Tercero released industrial contaminants into the river, leading to temporary water quality degradation and prompting remediation efforts.
- Water quality – Ongoing monitoring indicates that agricultural runoff (nutrients and pesticides) poses a risk of eutrophication in downstream sections.
- Biodiversity – The river supports typical lowland freshwater fish species of the Paraná basin, though comprehensive inventories are limited.
Historical and Cultural Notes
The name “Tercero” (Spanish for “third”) follows a naming convention used during the early colonial period in Córdoba, where three principal rivers were designated Río Primero (First River), Río Segundo (Second River), and Río Tercero (Third River). The city of Río Tercero, founded in the late 19th century, derives its name directly from the river that runs through it.
See also
- Carcarañá River
- Paraná River basin
- Río Primero (Córdoba)
- Río Segundo (Córdoba)
References
- Instituto Geográfico Nacional (Argentina). “Cartas Topográficas de la Provincia de Córdoba.”
- Secretaría de Recursos Naturales y Medio Ambiente de la Provincia de Córdoba. “Cuadro de Afluentes del Cuenca del Paraná.”
- Ministerio de Medio Ambiente y Desarrollo Sustentable (Argentina). “Inventario Nacional de Calidad del Agua.”
(All information reflects data available from Argentine governmental and scientific sources up to 2023.)