A na-ejikarị ọkpọkọ nchara spral na ọkpọkọ drainage nke obodo ukwu. Ojiji nke ọkpọkọ nchara gburugburu na sistemu mmiri na-agbapụta n'obodo mepere emepe bụ nhazi zuru oke nke mmiri n'obodo mepere emepe, ọkọnọ mmiri, ọkọnọ mmiri, igbapu mmiri, ọgwụgwọ nsị, na sistem ndị ọzọ na akụkụ ha dị iche iche n'ime ...
GỤKWUO