On the western shore of Poyang Lake, a massive stone bow curves against the water. This is the Ziyang Embankment, also known as the Nankang Xingwan Stone Embankment. Spanning five hundred meters, this ancient harbor barrier has shielded vessels from the lake's violent, wind-driven waves for nearly a thousand years.

Its story began in the late eleventh century when the military governor Wu Shenli drove wooden posts into the mud to form a basic barrier. In 1105, local official Sun Qiaonian replaced the wood with stone and carved out deep harbor basins. By 1180, the harbor lay in ruins. The philosopher-governor Zhu Xi, who wrote under the name Ziyang, arrived during a devastating drought. To save his starving people, he organized a massive public works project. He petitioned the imperial court for funds, mobilized local laborers, and paid them in grain to raise the stone wall by three feet.

To build it, laborers hauled and stacked heavy rectangular granite slabs, placing them precisely in twenty layers. The resulting structure, seven to eight meters wide, arches outward to deflect the crashing waves. Behind this granite shield lie the East and West Basins, quiet sanctuaries that once sheltered a thousand small boats. A multi-arch stone bridge, the Ziyang Bridge, spans the gap between the shore and the barrier, its cool stone conduits allowing water and fishing boats to pass. During the Ming Dynasty, prefect Tian Guan added the Tiangong Embankment to the east, expanding the harbor's reach.

Today, the twenty-eight-thousand-square-meter complex stands as a monument to ancient engineering. Designated as a national-level cultural relic in 2013, the site underwent a major restoration starting in March 2021. Workers cleared centuries of accumulated silt from the basins and repaired the weathered granite. During the dry season, the lake recedes, exposing vast green grasslands around the nearby Luoxingdun island. The ancient stone embankment remains, a silent witness to the generations of hands that shaped, stacked, and preserved its path.