33 CFR 334.2 : Navigation And Navigable Waters (§ 1.01-1 To Parts 404-499) — (Parts 200-202 To Parts 404-499) — Corps Of Engineers, Department Of The Army, Department Of Defense (Parts 200-202 To Parts 386-399) — Danger Zone And Restricted Area Regulations (§ 334.1 To § 334.1490) — Definitions.

(a) Danger zone. A defined water area (or areas) used for target practice, bombing, rocket firing or other especially hazardous operations, normally for the armed forces. The danger zones may be closed to the public on a full-time or intermittent basis, as stated in the regulations.

(b) Restricted area. A defined water area for the purpose of prohibiting or limiting public access to the area. Restricted areas generally provide security for Government property and/or protection to the public from the risks of damage or injury arising from the Government's use of that area.