South Penghu National Park is a Taiwanese national park located in the southern part of the Penghu archipelago. This national park encompasses Dongjiyu, Xijiyu, Dongyupingyu, Xiyupingyu islands, other islets, and the surrounding waters. It is an important ecotourism destination, featuring a mysterious underwater lavender forest. The underwater coral reefs, covered in purple hues, are visible from the shore, creating a magical scene.