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Geological Features 
 
 
  Fenghsan's land, in terms of the soil's drainage and nutrient holding capacity, can be categorized into three types: high-yielding rice fields, dry fields and barren slope land. First of all, the deposition area at the end of Mt. Ali makes up Fenghsan City.

  The upper layer is covered with sand and mud carried by Fenghsan Stream; for this reason, the texture of the yellowish soil appears sandy. In late Ming dynasty, the early immigrants, who migrated to Taiwan with Cheng, Cheng-Kung toiled and cultivated this piece of plain. By applying the farming skills from home and irrigating the crops with the water from natural resources, they finally turned this place into high-yielding rice fields. Furthermore, some other areas which were short of water supply turned out be dry fields. As to the slope land, owing to its content of unwanted or harmful chemicals like iron oxide, its texture appears tough and rough; accordingly, it is barren and thus not good for farming. The area around Chihsan is one of its kind.


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