The Rio Apodi, also known as the Apodi-Mossoró River, flows through the semiarid Sertão region of Rio Grande do Norte, Brazil, draining a landscape shaped by low annual rainfall of 400–800 mm and high evaporation rates. The river's name derives from the Tupi language, meaning "river of the ipês" or "river of the flowering trees," a legacy of the indigenous Tapuia Paiacu people of the Tarairiú ethnic group who historically inhabited the region. The river is impounded by a cascade of reservoirs — Major Sales, Flechas, Pau dos Ferros, and Santa Cruz — that have fundamentally shaped the aquatic habitat and fish communities found throughout the system. The riparian zone reflects the harsh Caatinga biome, with drought-adapted vegetation including jurema-preta, catingueira, and spiny Cnidoscolus species. Artisanal fishing communities along the river have practiced traditional techniques for generations, harvesting species like pacu and traíra using ancestral ecological knowledge passed down through local fishing groups.