Chiayi officially known as Chiayi City, is a city located in the plains of southwestern Taiwan. Formerly called Kagee during the late Qing dynasty and Kagi during the Japanese era its historical name is Tirosen.
Chiayi City is located on the north side of Chianan Plain, south west of Taiwan Island. On the east side is the Mount Ali, on the west side is the Chiayi Airport, on the north side is the Puzi River and on the south side is the Bazhang River. The distance from east to west of Chiayi City is 15.8 km (9.8 mi) and from north to south is 10.5 km (6.5 mi) with a total area of 60.0256 km2 (23.1760 sq mi). Chiayi City is completely surrounded by Chiayi County. Most of Chiayi City land are broad flat fertile plains. The terrain slowly rises from west to east. Chiayi is also one of the closest Taiwanese cities to the Tropic of Cancer, with the latitudinal line lying just south of the city.