Taichung, officially Taichung City, is a special municipality located in central Taiwan. Taichung is the second largest city of Taiwan, with more than 2.85 million residents, making it the largest city in Central Taiwan. It serves as the core of the Taichung–Changhua metropolitan area, the second largest metropolitan area in Taiwan.

Plains indigenous peoples, also known as Pingpu people and previously as plain aborigines, are Taiwanese indigenous peoples originally residing in lowland regions, as opposed to Highland indigenous peoples. Plains indigenous peoples consist of anywhere from eight to twelve individual groups, or tribes, rather than being a single ethnic group. They are part of the Austronesian family. Beginning in the 17th century, plains indigenous peoples have been heavily influenced by external forces from Dutch, Spanish, and Han Chinese colonization of Taiwan. This ethnic group has since been extensively assimilated with Han Chinese language and culture; they have lost their cultural identity, and it is almost impossible without careful inspection to distinguish plains indigenous peoples from Taiwanese Han people.