Rio Jenipapo winds through the semi-arid Caatinga landscape of Piauí state in northeastern Brazil, a region defined by its dramatic seasonal contrasts and resilient ecology. The river flows through a basin shaped by intermittent rainfall patterns, meaning water levels and aquatic habitat availability shift dramatically between the wet and dry seasons. A dam on the Piauí River — the Jenipapo dam — plays a central role in shaping the hydrology and fish communities of the broader basin. The riparian corridor along the river supports gallery forests and floodplain vegetation that stand in striking contrast to the surrounding xerophytic Caatinga scrub, creating a biologically rich zone that sustains fish populations, invertebrates, and a wide array of wildlife. The river's character is fundamentally tied to the pulse of seasonal rainfall, with wet-season flows driving productivity and dry-season conditions concentrating aquatic life in deeper pools and reservoirs.