Guishan Island, as known as Guishan Yu, is a famous landmark in Yilan. It is also the only active volcano in Taiwan. It got its name because its shape resembles a turtle. Being a strategic pass, Guishan Island was once listed as a military ground. The geological conditions of Guishan Island are very special, forming a number of unique and spectacular sceneries, such as the morning sun of Guishan, and the sight of turtle eggs.