Still, I don't consider the CME definition to be anything else than another megalopolis-like definition. It's useless for size comparisions with other worldwide megacities because when the definition starts to go beyond the boundaries for the Região Metropolitana of São Paulo, there's not much of continuous built-up areas connected with the central urban agglomeration (except perhaps for the extension to the area around Santos). To mention its existence is fair, but to use this definition to rank the São Paulo area as 2nd in the world is to take this too far. I consider IBGE to be the only reliable source for official Metropolitan Area definitions for Brazil, and I haven't seen CME mentioned by them so far. But, perhaps someone has other information about this?