“…The roles of their public and private sectors in regional formation vary in form and sophistication. Although much work on megacity regions now exists (e.g., Simmonds and Hack, 2000;Hall, 2001;Scott, 2001;Herrschel and Newman 2002;Salet, Thornley, and Kreukels, 2003;Laquian, 2005;Hall and Pain, 2006;Kidokoro, et al, 2008), none are devoted to exploring experiences and broad questions related to governance and planning in mega-city regions from an international comparative perspective. Moreover, despite the fact that superagglomeration, or city-regions, in the global south have attracted substantial attention (e.g., Scott, 2001;Stren, 2001;Douglass, 2001Douglass, , 2002Laquian, 2005;Wu and Zhang, 2007;Xu, 2008), we still know far less about how regions have evolved in developing countries compared to the regions of advanced capitalist states even though the largest and fastest-growing urbanized locations are situated in this part of the world.…”