Con Vanh

Seen from the mainland, Cồn Vành looks like a thin green band lying far out toward the sea. It is not a mountain. It is a bank of sand and silt that the Red River has built up over hundreds of years, slowly rising from the water and covering itself with trees. What stands here is a new piece of the Red River Delta, more than a beach, still being made in front of people's eyes.

The bank lies in Nam Phú commune, in the Tiền Hải area. That area was part of Thái Bình Province. After the provinces were reorganized in 2025, it belongs to the new Hưng Yên Province. On maps and road signs, both the old name and the new one may appear.

In 2016, the national tourism authority published figures for the place. They give Cồn Vành nearly 2,000 hectares, with a stretch of coastal beach about 6 kilometers long, along with mangrove forest and casuarina forest. Not long ago, reaching it meant going by boat, because it lies 7 kilometers from the mainland. Today a road crosses the gap, running through the mangroves and the casuarina trees.

That stretch of road is one of the memorable parts of the place. A vehicle passes along a narrow green corridor, with trees and shade on both sides, and then the sea slowly comes into view. Mangroves are not only pretty. UNESCO's description says their roots hold the silt, slowly raise the shoreline, and make a home for many kinds of living things. This belt of forest has protected Cồn Vành from erosion, and it lets the bank keep growing.

Cồn Vành and the whole Tiền Hải coast lie inside the Red River Delta Biosphere Reserve. A biosphere reserve is a UNESCO-recognized area where nature is protected and the people living there keep working the land. UNESCO recognized this one on December 2, 2004. The reserve covers more than 105,558 hectares of river-mouth land across Ninh Binh and Nam Định. It also reaches into what was Thái Bình. It has two important core areas. One is Xuân Thủy National Park, in the old Nam Định province, now part of Ninh Binh. The other is the Tiền Hải Wetland Nature Reserve, in what was Thái Bình.

The ecosystems here include estuary wetlands, mangrove forest, mudflats, beaches and seagrass beds. The area also lies on an important migration route for waterbirds. So the view holds more than trees and sea sand: a chain of linked life, from silt to forest, from mudflats to sea creatures and migrating birds.

On public holidays, Cồn Vành draws many visitors who come to swim and to see the view. A Thái Bình newspaper once described people lined up one behind another on the narrow road through the casuarina forest, all heading toward the sea shining ahead.

Cồn Vành is a simple place. It has no grand buildings and no ranking of its own. What it offers is the cool green road through the mangroves, the salt wind at the mouth of the Red River, and the sight of silt and water meeting. This is land that the river itself keeps building, day after day, quietly pushing the shoreline out into the sea. The ground at Cồn Vành did not exist a few hundred years ago.