New York Harbor Storm-Surge Barrier
The New York Harbor Storm-Surge Barrier is a proposed flood barrier system to protect the New York-New Jersey Harbor Estuary from storm surges. The proposed system would consist of one barrier located across the mouth of Lower New York Bay, possibly between Sandy Hook (N.J.) and Rockaway (N.Y.), and a second on the upper East River to provide a ring of protection to most of the bi-state region.
Source: Wikipedia — New York Harbor Storm-Surge Barrier (CC BY-SA 4.0)