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Ron Van Oers · CC BY-SA 3.0 igo
Landmark East Asia wonder

Puerto Princesa Underground River

3000 BCE – still standing

World's longest navigable underground river in the Philippines

Wikipedia

The opening of the article, and a way into the rest of it without leaving the site.

Puerto Princesa Subterranean River National Park on Wikipedia.

Elsewhere in East Asia at the time

Records whose own span overlaps this one, found by the same test the canvas draws with. The bar under each card is where it sits inside this one.

See the whole view
Image credits8 pictures from Wikimedia Commons