Daejeon is the fifth-largest metropolis in South Korea, with a population of nearly 1.5 million people. It is situated in a central lowland valley located between the Geum River and the Sobaek Mountains.
The city serves as a major transportation hub that originally developed as a railway town; it remains accessible to Seoul via KTX or SRT high-speed rail, with a travel time of approximately 50 minutes. Daejeon is recognized for its role as a technology and research center, characterized by a close relationship with the surrounding natural environment.