The stratum of Yehliu is mainly composed of sedimentary rocks; the formation of sea bays is due to the impact of sea erosion on softer rock layers, while those hard and solid ones may therefore turn into sea capes eventually. The prospect as presented from a long distance view of Yehliu Cape is like a turtle crouching down by the sea; therefore, the cape is also called “Yehliu Turtle”. In the olden days, Yehliu was a key channel of the trade route between mainland China and Keelung harbor. Yet, the waters around the area were torrential and dangerous, and often caused serious shipwrecks.