底江（越南語：Sông Đáy／瀧底），又名喝江（越南語：Hát giang／喝江）[1]，是越南北部紅河的四大支流之一（其餘為沱、梂和瀘三江），流經河內市、河南省和寧平省，最終在寧平省金山縣底江口注入北部灣。
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