ni akoole ninu ISO 3166-2, apa opagun ISO 3166 ti International Organization for Standardization (ISO) tejadesiwe to setumo awon amioro fun oruko awon ipinsabe koko awon orile-ede.ItokasiISO 3166.. 
Idasile gboogi ki o ti di odun 1960 je egberun meta o le irinwo (3,400) iwon cubic ni iṣẹju aaya (120, 000 Cu/s) fun odo Benue ti Niger si je (2,500) ni iṣẹju aaya (88,000 Cu/s)..