coastline, shoreline / a railroad that follows a coastline

protection of a coast (fortification, etc. to avoid flood damage); revetment

line / level / beam

construction, building (of a dam, bridge, or other large project) / establishment of an organization

construct, build (a large project, e.g. a dam, a bridge, a skyscraper, etc.) / establish an organization

coast; shore (the border between land and sea)

protection; safeguard

to shield (to protect, to defend)

a construction site

(obsolete) Synonym of コートジボワール (Kōto Jibowāru, “Côte d'Ivoire”): Ivory Coast (a country in West Africa)