Beimen, located in the northwestern coastal region of Tainan, is the most developed township for the salt production industry in Taiwan. In the past, nearly every household relied on salt production for their livelihood. Today, it has further developed into a major festival that uses salt as a medium.
Located on the Chianan Plain, Guantian in Tainan has a hot and humid climate that is ideal for growing water caltrops, rice, sugarcane, and mangoes. Guantian has the largest area and highest production of water caltrops in the country, earning it the title "The Land of Water Caltrops."