In the late 19th century, the Taipei area, where the major Han Chinese settlements in northern Taiwan and one of the designated overseas trade ports, Tamsui, were located, gained economic importance due to the booming overseas trade, especially that of tea export. In 1875, the northern part of Taiwan was separated from Taiwan Prefecture and incorporated into the new Taipeh Prefecture as a new administrative entity of the Qing dynasty. Having been established adjoining the flourishing townships of Bangka, Dalongdong, and Twatutia, the new prefectural capital was known as ''Chengnei'' (), "the inner city", and government buildings were erected there. From 1875 until the beginning of Japanese rule in 1895, Taipei was part of Tamsui County of Taipeh Prefecture and the prefectural capital.