- Iki City is a city located in Nagasaki Prefecture, Japan. It is situated on the island of Iki, which is located in the Tsushima Strait between the Japanese mainland and the Korean Peninsula. Iki City has a population of approximately 25,000 people and covers an area of about 139 square kilometers. The city is known for its beautiful coastline, historic sites, and traditional festivals. It is a popular tourist destination, particularly for those seeking a scenic getaway.