What network is Rio on?

Could you please clarify which network you are referring to when you ask "What network is Rio on?"? If you're referring to Rio de Janeiro as a city, it's not typically associated with a specific blockchain or cryptocurrency network. However, if there's a specific project, service, or initiative named Rio that operates on a blockchain, you'll need to provide more context for me to give an accurate answer. In general, different cryptocurrencies and blockchain-based projects utilize various networks, such as Bitcoin's blockchain, Ethereum's network, or the Binance Smart Chain, among others.