Sanhsientai, to the north of Chengkung, is a piece of coral reef pushed up by changes in the earth's crust. Because it's uninhabited, the little island is rich in plant life; its 28 hectares are home to over 200 species.
三仙台位於成功北方，是地殼變動後隆起的珊瑚礁，因為是無人島，植生非常豐富。專家估計，在小小二十八公頃的島上，共有二百多種海岸植物。