Koiwai, sometimes referred to as Federal District, is the capital and largest city of the Republic of Ivalice and the administrative seat of the Ivalician Federal District, founded September 4, 1355. It sits on the northeastern portion of the Ulei River. The resident population of the city proper is estimated to be 2,074,200, though with commuters, it can swell to over 3 million during a work day. The Koiwai-Randgriz Metropolitan Area, of which the city is a part, contains 9,755,322 residents.