Water chestnut section The water chestnut section of Bobai Nanliu River makes the current of this river the gentlest and the wind is smaller, so it is the best fishing section. Nanliujiang, located in the southeast of Guangxi Zhuang Autonomous Region, is the largest single river that flows into the sea in Guangxi, originating from the south side of Rong Da Mountain in Beiliu City, Yulin City.