noun
embankment; levee; bank; weir
A raised structure built along a river, coast, or other water body to prevent flooding or erosion. 堤防 is the general term; 堰 (せき) is a weir/dam for controlling water flow, not a flood-prevention embankment.
大雨で川の堤防が決壊した。
The river embankment collapsed due to heavy rain.
海岸沿いに長い堤防が築かれている。
A long levee has been built along the coast.