The Río Plujunta is a watercourse located in the province of Córdoba, Argentina, functioning as the westernmost distributary channel of the Río Segundo as it approaches its terminus. This channel plays a role in the broader hydrological system of central Argentina's interior, ultimately carrying waters into the vast Mar Chiquita lagoon — one of the largest saltwater lakes in South America. The Río Plujunta forms part of the great endorheic basin of central Argentina, a closed drainage system shared with the Río Primero (Suquía) and the Río Dulce, all of which drain into Mar Chiquita rather than reaching the ocean. This unique geographic and hydrological context gives the Plujunta a character quite different from mountain trout streams, placing it firmly within the pampa lowland environment of eastern Córdoba.