The 140-kilometer long Tachia River, originating in Taiwan's high central mountain range and running westward through Taichung County before draining into the Taiwan straits, generates the largest amount of hydroelectric power of any river in Taiwan.
大甲溪具有極豐富的水利資源，流路共長 140 公里，發源於台灣中央山脈，向西流，經台中縣境後注入台灣海峽。