Bridging the Megacity. Between water and sky is a research project developed for the 4th Seoul Biennale of Architecture and Urbanism 2023. The project constitutes the contribution of the DiAP Department of Sapienza University to the Biennale's thematic focus on the concept of inhabited bridges. Within this international context, the project investigates the contemporary significance of this topic in relation to the major challenges facing our society, including climate change, which redefines the very notion of the megacity. Bridging the Megacity. Between water and sky was designed and realized by the research team coordinated by Orazio Carpenzano and Alfonso Giancotti, and composed of Fabio Balducci, Daniele Frediani, Paolo Marcoaldi, and Luca Porqueddu, with Diana Carta, Domenico Faraco, Roberta Manno, Fabrizio Marzilli, Andrea Parisella, and Claudia Ricciardi.