ia ' s ▁land ▁mass . ▁Histor ically ▁and ▁cart ograph ically , ▁it ▁consists ▁of ▁present - day ▁Bay els a , ▁D elta , ▁and ▁R ivers ▁States . ▁In ▁ 2 0 0 0 , ▁however , ▁Ob as an jo ' s ▁regime ▁included ▁Ab ia , ▁Ak wa - I b om , ▁Cross ▁River ▁State , ▁E do , ▁Im o ▁and ▁O nd o ▁States ▁in ▁the ▁region . ▁ ▁The ▁Niger ▁D elta , ▁and ▁the ▁South ▁South ▁ge opol it ical ▁zone ▁( which ▁contains ▁six ▁of ▁the ▁states ▁in ▁Niger ▁D elta ) ▁are ▁two ▁different ▁entities . ▁The ▁Niger ▁D elta ▁separ ates ▁the ▁B ight ▁of ▁Ben in ▁from ▁the ▁B ight ▁of ▁Bon ny ▁within ▁the ▁larger ▁G ulf ▁of ▁Guinea . ▁ ▁Dem ograph ics ▁Some ▁ 3 1 ▁million ▁people ▁of ▁more ▁than ▁ 4 0 ▁eth nic ▁groups ▁including ▁the ▁B ini , ▁E fik , ▁Es an , ▁I bib io , ▁Ig bo , ▁Ann ang , ▁Y or uba , ▁Or on , ▁I j aw , ▁Og ba , ▁I k wer re , ▁Ab ua / O du al , ▁It se ki ri , ▁Is oko , ▁Ur h ob o , ▁U kw u ani , ▁Kal ab ari , ▁Ok ri ka , ▁Og oni , ▁E pie - At issa ▁people ▁and ▁O bol o ▁people , ▁are ▁among ▁the ▁inhabitants ▁of ▁the ▁political ▁Niger ▁D elta ,