The Río de la Reconquista flows through the densely populated western suburbs of Buenos Aires Province, Argentina, draining a significant portion of the Pampean lowlands before emptying into the Río Luján. As a lowland Pampean stream, it winds through flat terrain characterized by slow-moving, turbid waters typical of the region's hydrology. The river and its tributaries, including the Arroyo La Choza, form a watershed that spans both rural agricultural zones and heavily urbanized areas, creating a wide range of water quality conditions along its length. Water clarity tends to be low throughout much of the system, a characteristic feature of Pampean streams influenced by fine sediment, agricultural runoff, and urban discharge.