Rakuzan

Rakuzan (洛山), officially Rakuzan City (海常都) is the second largest city in the Federal Kingdom of Teiko and is one of the three direct government controlled districts together with Kaijo and Tetsuya. Rakuzan exists as designated city until 2001 when it was approved to be a metropolitan prefecture but it's main jurisdiction only encompass the original 10 wards of the former City of Rakuzan. In 2015, it has an estimate population of 4.8 million people making it the the fifteenth largest urban agglomeration among member nations of the Alliance of Independent Nations.

Twin towns and sister cities
Alliance of Independent Nations

Worldwide
 * 🇯🇵 Japan Osaka, Japan (since 1998)