Northern Anvil Island. There are two Anvil Islands in Penghu, named for their resemblance to anvils. There are two Anvil Islands in Penghu, named for their resemblance to anvils. Northern Anvil Island, belonging to Baisha Township, is located northwest of the main island of Penghu. It is an uninhabited island, primarily composed of a basalt mesa, surrounded by steep sea cliffs. The volcanic breccia at the base of the columnar basalt is relatively fragile. Due to the influence of the northeast monsoon, the rock layers on the north shore have been eroded by currents over a long period, forming a huge sea cave that even small boats can enter. Its scale is larger than the Blue Cave in Ciji Island, making it the largest sea cave in Penghu. Because sunlight does not reach inside the cave, the temperature is three to five degrees lower than outside, hence it is also called the "Air-Conditioning Cave." There are two Anvil Islands in Penghu, named for their resemblance to anvils. Northern Anvil Island, belonging to Baisha Township, is located northwest of the main island of Penghu. It is an uninhabited island, primarily composed of a basalt mesa, surrounded by steep sea cliffs. The volcanic breccia at the base of the columnar basalt is relatively fragile. Due to the influence of the northeast monsoon, the rock layers on the north shore have been eroded by currents over a long period, forming a huge sea cave that even small boats can enter. Its scale is larger than the Blue Cave in Ciji Island, making it the largest sea cave in Penghu. Because sunlight does not reach inside the cave, the temperature is three to five degrees lower than outside, hence it is also called the "Air-Conditioning Cave." If you land on the island
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