Could a six-mile-long wall, stretching from the Rockaways in Queens to land in New Jersey south of Staten Island, have protected New York?

The Army Corps of Engineers is studying five plans for barriers — four of which include configurations of retractable sea walls — to block storm surges.

[This $119 billion sea wall could defend New York … or not.]

It appears that the sea barrier is one wall that President Trump doesn’t like.

Reacting to my colleague Anne Barnard’s front-page story on the plans, he tweeted Saturday that a “massive 200 Billion Dollar Sea Wall, built around New York to protect it from rare storms, is a costly, foolish & environmentally unfriendly idea that, when needed, probably won’t work anyway.”

He added: “It will also look terrible. Sorry, you’ll just have to get your mops & buckets ready!”

Other critics say that the Corps’ plans would not adequately protect New York from rising tides and storm runoff.