Why is the Turtle Island called so?

The Turtle Island, located about 10 kms off the coast of Toucheng in Yilan County (Taiwan), has a volcanic terrain that, from certain angles, looks like a turtle floating in the sea. Hence, it is known as Turtle Island. Among the features of the island are high cliffs, steaming fumaroles (an opening in a volcano), welling underwater hot springs, mountain peaks, sea-eroded caves, a lake and unique cliff vegetation as well as rich marine ecological resources.