noun
seawall; tsunami wall
A wall built along the coast to protect against waves and tsunamis. Often used in disaster prevention contexts.
東日本大震災の後、高い防波壁が建設された。
After the Great East Japan Earthquake, high seawalls were constructed.
この町は防波壁で津波から守られている。
This town is protected from tsunamis by a seawall.
Compound of 防 (defend), 波 (wave), and 壁 (wall).