River, eastern China.
It flows east for 660 mi (1,100 km) and discharges into Hongze Lake in Jiangsu province. With its many tributaries, it is subject to extensive flooding; work to control the flooding is ongoing. River traffic from the Huai joins the Grand Canal , providing water transport routes north to the Huang He (Yellow River) and south to the Yangtze River (Chang Jiang).