Turtle island is a small, solitary island with a land mass of 2.9 square kms, located about 10kms off the coast of Toucheng in Yilan County, Taiwan. The island used to be a military controlled area and it is not until the year 2000, the government allows access for tourism purposes. The island has volcanic terrain that from certain angles looks like a floating turtle in the sea, hence the name “Turtle island”.

Among the features of the island are high cliffs, steaming fumaroles, mountain peaks, sea-eroded caves, a lake, rich in marine ecological resources and the best of all, welling underwater hot springs. The seabed hot spring offers a murky smell of sulfur in the area, the milk-colored hot spring spurting from the seabed, mixing the sea water with a lighter blue in color, locals also given this area a nickname of “The Ying Yang Sea”. Under the water, hot water and bubbling everywhere from cracks in the seabed.