A sea open to all nations. See Mare clausum.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). open sea. Retrieved September 20, 2026, from http://smartdefine.org/open_sea/definitions/2038960 |
| Chicago | Webster's. 2011. "open sea" http://smartdefine.org/open_sea/definitions/2038960 (accessed September 20, 2026). |
| Harvard | Webster's 2011, open sea, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/open_sea/definitions/2038960>. |
| MLA | Webster's. "open sea" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/open_sea/definitions/2038960> |