濁水溪
The Atayal people arrived in Yilan around 250 years ago and settled along the upper Dazhuoshui River. Later, the tribes crossed the Siyuan Pass to reach the valley upstream of the Zhuoshui River. These people are the current residents of Datong Township. Other parts of the Atayal people headed east to enter and settle along the Nan'ao North River and Heping North River. These groups are now settled in Nan-ao Township.