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Hongze Lake, Wade-Giles as Lake Hungtze or Hung-tse, is the fifth-largest freshwater lake in China. Although it is known to have existed from antiquity, it drastically increased in size during the Qing dynasty when the still flowing south of with the Huai River. The increased sediment and flow combined to greatly expand the lake, swallowing the previous regional center of Sizhou and the Ming Zuling tombs. During the Imperial China and republican periods, the lake formed part of the border between Jiangsu and Anhui provinces but since 1955 the previous borders have been shifted to place it entirely under Jiangsu's administration. It is now encompassed by the counties of Sihong County and Siyang County in Suqian Prefecture and Xuyi County and Hongze County in Huai'an Prefecture. Since the establishment of the People's Republic of China, the lake has generally decreased in size as more of its inflow has been diverted for irrigation.
Under the Han dynasty, Fuling was renamed Pofu Pond. Acting as part of Lü Bu's faction, the Guangling administrator Chen Deng completed the first part of the Gaojia Weir Gāojiāyàn) around the year Jian'an 5 (around 200), a massive 30-li levee intended to protect nearby farmland and the Hangou Canal and nearby settlements and farmland from floods of the Huai.Huai'an (30 Jan. 2018).SHLWSA (7 Sept. 2020).
Under the Sui dynasty, the Hangou Canal and lake were connected to other waterways north and south to create the Grand Canal. During an inspection tour in 616, Emperor Yang renamed Pofu Hongze in his delight at the rain that greeted his arrival there, the rest of the countryside having suffered a drought. When it further expanded under the Tang dynasty, it became known as Hongze Lake. A massive flood of the Yellow River redirected it south of Shandong in 1128 or 1194, stream capture of the Si River to join the Huai below Huaiyin. The silt from the Yellow River began to obstruct the flow of the Huai and stream pool Hongze still farther, ultimately quadrupling its original size. During this period, it became an important fishery and center of irrigated cropland. It still forms the origin point of the North Jiangsu Main Irrigation Canal. Under the Yuan dynasty, the course of the Grand Canal in the area was straightened to circumvent the lake.
Under the Hongwu Emperor, the first emperor of the Ming dynasty dynasty, the Ming Zuling garment tomb was built near the regional center Sizhou to honor his ancestors, whom he posthumously elevated to imperial status. Under his son the Yongle Emperor, the Gaojia Weir was further expanded, in part to protect the site. In Wanli Era 7 (c.1579), Pan Jixun enlarged and reinforced the weir with stone along its then of length. His mismanagement of the area's difficult hydrology allowed Sizhou to flood and threatened the tombs, leading to his demotion and dismissal.
By the Qing dynasty, the Yellow River had built up enough silt that it changed course again to merge with earlier tributaries of the Huai. In Kangxi Era 16 (), the viceroy of rivers Jin Fu Jìn Fǔ, 16331692) extended the embankments from Zhouqiao to Jiangba Jiǎngbà). A few years later in 1680, the increased silting produced enlarged Hongze Lake so much that it entirely consumed Sizhou and the Ming Zuling. The Kangxi Emperor and continued the expansion and reinforcement of the Gaojia Weir, reaching and completing the modern Hongze Lake Embankment. Altogether, from Wanli Era 3 () to Xianfeng Era 5 (), the Gaojia Weir and Hongze Embankment burst 140 times, involving breaches in 300 different sections. During the worst breaches, the lake level fell as much as . On one occasion in the 19th century, the Daoguang Emperor held the Jiangnan river supervisor Zhang Wenhao Zhāng Wénhào, d.1836) in chains at the repair site for a month during repairs necessitated by his mismanagement of when the dams need to be closed and opened; he was then dismissed to serve in the Xinjiang border guards. For their part, local people made prayers and offerings to nine Chinese dragons jiǔ lóng) near Zhouqiao for protection; the Chinese temple was lost in a flood. In the early 1850s, the massive floods of the Yellow River that occasioned the Taiping Rebellion restored the Yellow River entirely to its northern course, finally removing its inflow and siltation from the lake.
Under the People's Republic of China, counties in Anhui that bordered the lake were ceded to Jiangsu in 1955 to allow unified administration of the lake. By the early 1960s, its water level had dropped enough that the stone statues of the Ming Zuling's sacred way were again visible along the shoreline. After the end of the Cultural Revolution, the provincial and national cultural preservation authorities excavated and restored the tombs, ultimately erecting a new levee to protect it from any further flooding. In 1966, 1976, and 1985, the Hongze Embankment itself was reinforced and improved with more modern engineering and materials, particularly with additional barriers to break up the force of the rivers' and lake's waves against the levees.
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