é ▁Province , ▁Gab on ▁ ▁Pl ate aux ▁Department , ▁which ▁is ▁a ▁first - level ▁sub div ision ▁in ▁Congo . ▁ ▁The ▁reaches ▁between ▁ 5 5 0 ▁and ▁ 8 3 0 ▁metres , ▁and ▁is ▁rich ▁in ▁mang an ese . ▁The ▁B ate ke ▁Pl ate au ▁is ▁an ▁ancient ▁vol can ic ▁area . ▁ ▁Several ▁rivers ▁rise ▁in ▁that ▁area , ▁including ▁the ▁Ni ari ▁River , ▁which ▁flows ▁in ▁Congo , ▁the ▁ ▁O go ou e , ▁M pass a , ▁N dj ou m ou , ▁Le k abi ▁and ▁Le key ▁R ivers ▁which ▁flow ▁in ▁Gab on . ▁ ▁See ▁also ▁ ▁Bat ék é ▁Pl ate au ▁National ▁Park ▁ ▁References ▁ ▁Per us set ▁André . ▁ 1 9 8 3 . ▁O ro - H ydro graph ie ( Le ▁Rel ief ) ▁in ▁Ge ographie ▁et ▁Cart ographie ▁du ▁Gab on , ▁Atlas ▁Illustr é ▁led ▁by ▁The ▁Min ist ère ▁de ▁l ' E ducation ▁N ationale ▁de ▁la ▁Repub lique ▁Gab ona ise . ▁P g ▁ 1 0 – 1 3 . ▁Paris , ▁France : ▁Ed ice f . ▁ ▁Pet ring a , ▁Maria . ▁Bra zza , ▁A ▁Life ▁for ▁Africa . ▁Blo om ington , ▁IN : ▁Author H ouse , ▁ 2 0 0 6 . ▁. ▁ ▁Descri bes ▁Pierre ▁Sav org nan ▁de ▁Bra zza ' s ▁extensive ▁expl or ations ▁of ▁the ▁Og ou é