The Erhjen River is a river in Taiwan. Taiwan ( Taiwanese: Tâi-oân/Tāi-oân (historically 大灣/台員/大員/台圓/大圓/台窩灣 is an Island in East Asia. It flows through Tainan County, Tainan City and Kaohsiung County for 65km. Tainan County is a county located in southern Taiwan. The name "Tainan" means simply "Southern Taiwan" Kaohsiung County ( POJ: Ko-hiông-kōan is a county in southern Taiwan administered as a county of Taiwan.