Chongming Island West Road. According to the Baidu map, there is a snack street in Chongming Island, which is located in Chenguangyuan snack street on Chongming Island West Road. Chongming Island is an alluvial island at the mouth of the Yangtze River Delta, the third largest island in China, the largest estuarine alluvial island in China and the largest sand island in China. It has a land-forming history of more than 1,3 years and is known as "the gateway to the Yangtze River and Yingzhou in the East China Sea". In 21, the whole island covered an area of 1,269.1 square kilometers.