‘Fáng hóng dī’ literally means ‘flood-prevention flood-embankment’ — it combines 防 (fáng, ‘to prevent’ or ‘to guard against’), 洪 (hóng, ‘flood’ or ‘torrential water’), and 堤 (dī, ‘dike’, ‘levee’, or ‘embankment’). Together, the term refers to a man-made raised structure built along rivers, lakes, or coastlines specifically to contain floodwaters and protect nearby communities, farmland, or infrastructure from inundation.

Flood-control dikes are common in low-lying or riverine areas across China — especially in the Yangtze and Yellow River basins — where seasonal monsoon rains and snowmelt pose recurring flood risks. They are often reinforced with concrete, stone, or vegetation and may be part of larger flood-management systems that include reservoirs, sluice gates, and early-warning networks. While technically similar to regular dikes (dī), 防洪堤 emphasizes purpose: flood defense rather than general water containment or land reclamation.