Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Ebe ọ na-agafe: Oké Osimiri Arctic bụ nke kasị nta na nke kasị omimi n'ime oké osimiri ise bụ́ isi e nwere n'ụwa. Òtù International Hydrographic Organization (IHO) na-ewere ya dị ka oké osimiri, ọ bụ ezie na ụfọdụ ndị ọkà mmụta banyere oké osimiri na-akpọ ya Oké Osimiri Arctic. A na-ekewa ya dị ka ọnụ mmiri nke Oké Osimiri Atlantic, a na-elekwa ya anya dị ka akụkụ kasị dị n'ebe ugwu nke Oké Osimiri Ụwa nke na-ekpuchi ihe nile.  Ajụjụ: Ònye maara na oké osimiri Arctic bụ oké osimiri?
Òtù International Hydrographic Organization (IHO)