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On the sea surface about one kilometre southeast of Jishan Island, you can see the four rock pillars that make up Dingkou Island, formed from basalt reefs. After the eruption, the magma created columnar joints in various directions. Subsequent erosion and weathering have sculpted the rocks into finer, more intriguing forms, earning the place a reputation reminiscent of the picturesque scenery of Guilin. The undulating terrain creates clusters of sea‑eroded columns, and between these columns a “line of sky” forms an extraordinary sight. This rare landscape gives the impression that “such a view exists only on Dingkou, nowhere else in Penghu can be found.” Dingkou Island is entirely composed of dense, dark basalt columns, similar to Jishan Island, and often contains clusters of olivine within the basalt. During winter, the reefs on the island, like those on Jishan, also grow natural seaweed. These fishing rights belong to the nearby villages and often bring significant income to the residents. Because the island is within a protected area, human interference is minimal. In summer, almost a thousand white‑eyed gulls choose this spot as a breeding ground, making it the most important habitat for white‑eyed gulls in the northern Penghu region. A boat trip to the surrounding waters allows you to easily admire the graceful dancing of the gull flocks.