Río Marapa flows through the southern reaches of Tucumán Province in northwestern Argentina, winding through a landscape shaped by the foothills and lowlands of the region. The river is an important waterway for the local communities and ecosystems of southern Tucumán, supporting native fish populations that attract both local anglers and sport fishing enthusiasts. The river has become a focal point for conservation-minded anglers who are increasingly vocal about protecting its native species and the health of its aquatic ecosystem.