how about jakarta??? i know it´s not the biggest metropolitan region, but i think it also should be mentioned... the metropolitan area of jakarta is called Jabotabek (JAkarta-BOgor-TAngerang-BEKasi) and it´s population estimated 23,6 million in 2005..so 2007 live more than 24 million people there. 2016 it´ll reach 32million. i´ve already been there and can tell you that numbers are wrong the dark figure is much much higher. registration in indonesia doesn´t mean the same as in europe/america interessting is also..1945 jakarta had 600.000 inhabitants..2007 more than 8million