Upo Marsh (우포늪)

On the low ground of Changnyeong County, South Gyeongsang Province, there is water that has pooled since the age when dinosaurs walked the earth. This is Upo Marsh. Seven and a half kilometers in circumference, its surface thick with prickly water lilies, it is the largest inland wetland in South Korea—and there are whispers that to reckon its true age is, somehow, an act of desecration.

For a time this place was known as a haven for swans and designated a natural monument, but in 1973 it lost that status on the grounds that migratory birds had grown scarce. Why the birds left, what drove them away—the official record notes only a decline in population. Decades later the state designated it a natural monument once more, and some of the birds returned. Yet those who walk the marsh's edge alone still say the sound of the water is louder than any birdsong.

More than 340 plant species, over 60 species of birds, eels and snakeheads, leopard cats and raccoon dogs—all of them layered together within a single marsh. The Ramsar Convention named this place an internationally protected wetland for its ecological value, but a different account circulates among the locals. This marsh does not release old things, they say. What has sunk remains sunken, and stays that way for a very long time.

In the dense fog before dawn, it is not uncommon to hear of someone who glimpsed a shape skimming across the surface—a whooper swan, perhaps, or a grey heron, or perhaps something else entirely—and yet no one ever looks long enough to be certain. In water that has stood still for over a hundred million years, there are surely things that have pooled there without ever being named. The people of the villages near the marsh say this plainly, without alarm.