RIO-NEGRO, daryoest dar Argentina, dar shimoli Patagoniya. Dar natijai hamrohshavii daryohoi Neukep va Limay, ki az kuhhoi And ibtido meyoband, ba vujud omadaast. Tulash az joi payvastshavi qarib 1000 kilometr.
Daryo az hamvorihoi khushki Patagoniyai Shimoli guzashta ba uqyonusi Atlantik merezad. Avvalhoi tobiston obkhez meshavad. Baze qismhoyash kishtigardand. GidroElektro Stansiya sokhta shudaast.