Luxury floating island: in pictures
+ The world's biggest superyachts
+ The world's most expensive private islands
"An Austrian company is planning to build a luxury floating island that can be moved according to its occupants’ wishes."
= "a sheet of ice, of variable size, floating in the sea"
A sea wall
A sea wall is "a wall, or embankment,
to resist encroachments of the sea."
= barrier, breakwater, dam, dike, etc..
A leaking dyke / dike (US)
A dyke (or dike)
= "A barrier constructed to contain
flow or water or to keep out the sea".
butch (n), dam (n), levee (n), dike (v).
The Little Mermaid