Sentence:  For the rivers , the 4 <WSD>represented</WSD> the Huai , to the ( then ) Southeast ; the 2 , the San Kiang ( three rivers ) in the ( then ) Southwest ; the 8 , the Chi in the Northeast ; and the 6 , the ( upper ) Yellow River in the Northwest . 
Meaning of the word marked with <WSD> tags:  express indirectly by an image, form, or model; be a symbol