Tourists enjoy themselves on the coastline of Wang'an in Penghu County, southeast China's Taiwan, May 10, 2019. (Xinhua/Zhang Guojun)

Photo taken on May 10, 2019 shows the scenery of basalt in Penghu County, southeast China's Taiwan. (Xinhua/Zhang Guojun)

A tourist enjoys herself on the coastline of Wang'an in Penghu County, southeast China's Taiwan, May 10, 2019. (Xinhua/Zhang Guojun)

Tourists enjoy themselves on the coastline of Wang'an in Penghu County, southeast China's Taiwan, May 10, 2019. (Xinhua/Zhang Guojun)

Cacti are seen on the coastline of Wang'an in Penghu County, southeast China's Taiwan, May 10, 2019. (Xinhua/Zhang Guojun)