Si Collection, Upper Volume Radical: Water (shuǐ) Entry: 潶 Kangxi stroke count: 16 Page 651, Entry 01 According to the Tang Rhyme (Tangyun), pronounced hei. A name of a river. In the Book of Documents (Shangshu), within the Tribute of Yu (Yugong) chapter, it is written as the Hei River, west of the river is the region of Yongzhou. Note: In the current version of the Book of Documents (Shangshu), it is written as the Black (hei) River.