"August 18 tide, spectacular world no." This is the Northern Song poet Su Dongpo praised Qiantang autumn tide of the ancient famous sentence. For thousands of years, Qiantang River with its strange river tide, I do not know how many tourists have dumped. Around August 18 of the lunar calendar every year, it is the best time to watch the tide. During this period, autumn sun, golden wind pleasant, Qiantang River mouth sea pond, tourists cluster, full of interest, competing for wonders.