The large expanses of mangrove forests are estimated to cover approximately  of land.. 
Ẹ̀ka Àṣà ti Ẹ̀ka Ìjọba fún Ọ̀dọ́, eré ìdárayá ati Asa ni ó dá kalẹ̀ ní ọjọ́ ogún oṣù kẹsan-an ọdún 1989 lábẹ́ ìdarí Order No.. 