Huadong Valley

The valley is believed to be part of the northern terminus of the Philippine Mobile Belt, a complex collection of tectonic plate fragments and volcanic intrusions. The valley is formed by the alluvial plains of three large river systems, namely the Hualien River, Xiuguluan River and Beinan River, all of which flow into the Pacific Ocean.

The Huadong Highway, a section of Provincial Highway No. 9, runs the entire length of the valley from north to south.