Which of the following cities does the designator code ICN represent?

The designator code ICN represents Incheon International Airport, which is located in Seoul, South Korea. This airport serves as the primary international gateway for the capital city and is one of the busiest airports in the world. Each airport has a unique three-letter IATA code that is used for passenger flights and booking purposes, allowing for easy identification and communication in the aviation industry. In this case, ICN is specifically assigned to the airport in Seoul, making it the correct answer among the options provided.