Whale Cave, Natural arch and cave in Xiyu Township, Taiwan
Whale Cave is a natural arch and cave carved into the black basalt cliffs along the coast of Xiyu, one of the Penghu islands in Taiwan. The opening cuts through the rock wall and allows seawater to pass through when the tide rises.
The formation took shape over centuries as monsoon winds and seawater slowly wore away the black basalt cliffs of Xiyu. The erosion has not stopped and continues to change the rock over time.
The name of this formation comes directly from its shape: seen from a certain angle, the rock opening looks like the outline of a whale. Locals and visitors alike tend to walk around the site searching for the angle where the resemblance is clearest.
The best time to visit is at low tide, when the rock formation is more accessible and the arch is easier to see from below. Footwear with a good grip is helpful, as the basalt surface can be wet and uneven underfoot.
The black basalt that makes up this arch was formed by ancient volcanic activity that shaped the entire Penghu archipelago, so the site sits within a much older geological story than the cave itself suggests. The hexagonal columns visible in the rock face are a direct result of lava cooling slowly, and the same pattern appears at several other points along the coast.
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