In the center of Poyang Lake, south of the Ziyang Embankment in Lushan City, lies Luoxingdun, a stone island measuring sixty meters long and thirty meters wide. Local folklore attributes its origin to a falling meteor, a legend recorded by Li Daoyuan in the Northern and Southern Dynasties text Shuijing Zhu. This small landmark, rising fifteen meters above the lakebed, gave the historic Xingzi County its name.

Luoxingdun functions as a natural indicator of the lake's seasonal breath. From June to September, rising waters submerge the island, leaving only the stone archway, the hexagonal pavilion, and the tip of the seven-story pagoda visible above the blue waves. During this wet season, the structures resemble a floating palace, accessible only by boat. From October to March, the water recedes, exposing a vast green grassland. Visitors can walk across the dry lakebed to touch the heavy sedimentary rock.

Human hands have shaped this eighteen-hundred-square-meter island since the Tang Dynasty. Ancient builders used specialized mortise-and-tenon joints and heavy stone masonry to anchor the structures against powerful currents. The timber components remain preserved because their prolonged submersion in the oxygen-deprived lake water prevents decay. Inside the stone pagoda, a spiral staircase leads upward, offering views of the distant Lushan Mountain.

The island has long inspired travelers. The Song Dynasty scholar Wang Anshi stood here and composed poetry, famously describing the mighty Yangtze River as a single wine cup. Other prominent figures, including Huang Tingjian and Zhu Xi, left their own inscriptions on the stone. Historical records show that the island's resident monks eventually abandoned their quarters during high-water seasons due to the difficulty of procuring supplies from the mainland. Today, the silent stone walls, weathered by centuries of floods, continue to watch the seasonal cycle of water and grass.