The tidal range can reach 7.3 meters, which is more than double the 2 or 3 meters of the average Taiwan coast. Especially in winter, there are perch caves everywhere. Especially in the intertidal zone of "Yongliu Island", all kinds of clams, mussels, sea urchins, Guanyin snails, nine holes, stone scorpions, bergamot, sea steel helmets, etc. will appear one by one.