Located inthe southern tip of the PenghuFong-GueiIsland，Fong-GueiCave is one ofthe well-known attractions in Penghu whichvisitors should not miss. It is used to be known as the "Fong-Guei Tail". Here， because the unique basaltcolumnar joints in Penghu are highlydeveloped， and are long-term eroded by the ocean waves， there formed a narrow ocean-erosionditch. The end ofocean-erosion ditch is eroded into an ocean-erosion cave， on the top of whichthere is a pinhole stretching into the ocean-erosion cave along the joint gap.Each week when the tides are coming， the ocean waves rush into the ocean-erosioncave along the ocean-erosion ditch， and as the air inside the cave is stronglysqueezed， it often sounds "Hoo…Hoo"， like the sound of blast furnace which oncepeople used to make a fire. Therefore， Fong-GueiCave is most famous for "Fong-GueiWave Sound"，the best place in PenghuCounty to hear wavesound. If you are lucky， when the waves are particularly strong， you can even see the pinholes on the roof of the cave emitting high column of water， which is very spectacular. In particular， accompanied by the special landscape of basalt， it looks very magnificent when overlooked in the early morning or sunset， full of poetic beauty. Next to Fong-Guei Cave， there is a cute two-story shell-shaped pavilion. You can go to appreciate the whole scenery and observe the spectacular basalt erosion features. At the side， there sell the Penghu specialties baked rolls and cold drinks. When visiting here， you should not only pay attention to the characteristics of topography， and listen to the well-known waves， but also should pay special attention to safety， because there is a recreation area without lifeguard configuration. We often see some tourists go down the rugged rock， but in fact， it is very dangerous. Anyhow， please pay special attention to safety here.