Sea defence is a term used to describe the measures taken to protect coastal regions from the destructive power of the sea. There are several synonyms for sea defence that are commonly used, including coastal protection, shore protection, and coastal defense. Coastal protection is a term used to describe the measures taken to protect the coast from erosion, wave action, and other natural forces. Shore protection refers to the measures taken to protect the shoreline from damage caused by waves and currents. Coastal defense is a broader term that encompasses all the measures taken to protect a coastal area, including both physical structures and natural features.