Osimiri Anambra ( Igbo : Ɔmambala ) na-eru 210 kilometres (130 mi) banye n'osimiri Naijama di na Anambra, Naijiria. Osimiri bụ ihe kacha mkpa na-eri nri na osimiri Niger dị n'okpuru Lokoja . A na-ewepụta mmiri iyi nke Ọmambala na Atlantik site na mpụta dị iche iche na-eme 25,000-skwiaa kilomita (9,700 sq mi) mpaghara Niger Delta . Omambala bụ aha chi nwanyị oge ochie nke osimiri ya na-esi na Uzo-uwa-ani n'okpuru ụwa ruo Aguleri, Anam, Nsugbe na ogbe Onicha, bụ ebe ọ na-ejikọta na Nkisi & Naija-kwora/Mgbakili Rivers na njem ha na Atlantik oshon, nye ụmụ amaala. Osimiri Ezu na Ezichi na-asọbakwa n'osimiri Anambra n'Agbanabọ na Oda n'otu n'otu. Enwere ọtụtụ akụkọ ifo na ihe omimi gbara gburugburu Omambala bụ nke butere nkọwa dị iche iche site n'ọtụtụ agbụrụ na mba, ya mere ndị nyocha Europe mbụ ji akpọ Omambala dị ka Anambra. Tupu e kee steeti, a na-ejibu Omambala na-ezo aka na mpaghara nke nwere Anambra ugbu a, akụkụ Kogi, Enugwu na Ebonyi steeti site n'aka ụmụafọ ala ahụ.