The silt alluvial fan in the place located in the opening of Zengwen Stream has plentiful organic compounds and nutritional salt everywhere and therefore this habitat also has abundant creatures. Everything when the tides ebb, the saltpan during no water period even provides the water birds with a great food source during their transition. Because the opening to sea of this land is an alluvial fan terrain, this saltpan looks from high above like an open fan. Nowadays, these saltpans have already fallen into disuse and with no production any more.