Suncheon Bay was kept by taking things away. The farmers around this tidal estuary on South Korea's south coast pulled 282 electricity poles out of their own fields, because the wintering cranes were hitting the wires. They gave up pesticide on the paddies, and the observation tower that once stood in the reeds came down for the same reason. It started in 1996, when residents saw off a plan to dredge sand from the river feeding the estuary. What they were protecting is 5.4 square kilometres of reed around open mud, with the channel winding out to the sea.
Your walk in crosses Mujin Bridge, named for a town that does not exist. Mujin is the fog-drowned setting of Korea's most anthologised short story, by a writer who grew up here. The fog is not invented: on still mornings it pools in the bay and drops the far reeds to grey shapes. Beyond the bridge a boardwalk loops through the reeds at eye level, stalks clicking over your head, close enough to the creek to watch an egret hold still and then strike without ever registering you. A trail switchbacks up the hill at the far end to Yongsan, where the channel shows you a silver S through the marsh with the flats and islands behind it. When the tide drops, harvesters lie chest-down on wooden sleds and kick themselves out over mud too soft to walk on, digging cockles by hand. That mud is the engine room: mudskippers, fish that breathe air and travel on their fins, and crabs by the million, enough to keep tens of thousands of birds through a winter. The hooded cranes come in from mid-October and stay to March, roosting on the open flats at night and flying to the paddies at first light, calling as they come. Suncheon held a garden expo in 2013 and then kept the garden, parked deliberately between the growing city and the marsh. The reasoning was blunt: a wetland dies when the town reaches its edge, so the town stopped a few kilometres short.