digplanet beta 1: Athena
Share digplanet:


Applied sciences






















"Blue water" and "Blue waters" redirect here. For other uses, see Bluewater (disambiguation) and Blue Waters (disambiguation)
"Green water" and "Green waters" redirect here. For other uses, see Greenwater (disambiguation).
"Brown water" and "Brown waters" redirect here. For waste water, see Blackwater (waste).
The four kinds of navigable water in the Gulf of Mexico.

Maritime geography is often discussed in terms of three loosely defined regions: brown water, green water, and blue water.


The elements of maritime geography are loosely defined and their meanings have changed throughout history. The USA's 2010 Naval Operations Concept defines blue water as "the open ocean", green water as "coastal waters, ports and harbors", and brown water as "navigable rivers and their estuaries".[1] Robert Rubel of the US Naval War College includes bays in his definition of brown water,[2] and in the past US military commentators have extended brown water out to 100 nautical miles (190 km) from shore.[3]

During the Cold War, green water denoted those areas of ocean in which naval forces might encounter land-based aircraft and brown water, land-based artillery.[2] The development of long-range bombers with antiship missiles turned most of the oceans to "green" and the term all but disappeared.[2] After the Cold War, US amphibious taskforces were sometimes referred to as the green-water navy, in contrast to the blue-water carrier battlegroups.[4] This distinction disappeared as increasing threats in coastal waters forced the amphibious ships further offshore, delivering assaults by helicopter and tiltrotor from over the horizon. This prompted the development of ships designed to operate in such waters - the Zumwalt class destroyer and the littoral combat ships. Rubel has proposed redefining green water as those areas of ocean which are too dangerous for high-value units, requiring offensive power to be dispersed into smaller vessels such as submarines that can use stealth and other characteristics to survive.[2] Under his scheme brown water would be zones in which ocean-going units could not operate at all, including rivers, minefields, straits and other choke points.[2]


Brown water[edit]

A "brown-water navy" focuses on coastal operations and primarily takes a defensive role.

Green water[edit]

The green water environment extends from the outer edge of the brown-water layer past any continental shelves, archipelagos and islands; perhaps a few hundred miles from shore. It is the most important maritime arena, including most coastal traffic and territorial waters, in which are found the great majority of a nation’s maritime police, customs, environmental, and economic concerns.

A "green-water navy" is capable of defense of its nation in depth and is a significant offensive force within its territory.

Blue water[edit]

The blue water environment extends from the outer edge of the green-water zone through the global deep ocean.

A "blue-water navy" can project its nation's power throughout the world. The blue water policy was a long-standing political philosophy in Britain in the eighteenth century, which sought to advance British power through use of the Royal Navy, although the term "blue water" did not appear until 1834.[5] Today the United States has by far the largest blue water navy, with 11 nuclear aircraft carrier task groups.


  1. ^ "Naval Operations Concept 2010 - Implementing the Maritime Strategy" (pdf). US Naval Service. p. 16. Retrieved 7 May 2012. 
  2. ^ a b c d e Rubel, Robert C. (Autumn 2010), Talking About Sea Control, Naval War College Review 63 (4): 44–46 
  3. ^ Burkitt, Laurie; Scobell, Andrew; Wortzel, Larry M. (July 2003). "The Lessons of History : The Chinese People's Liberation Army at 75" (pdf). Strategic Studies Institute, U.S. Army War College. p. 185. Retrieved 7 May 2012. 
  4. ^ Gillespie, T.C.; Lesher, S.M.; Miner, P.D.; Cyr, B.P. (7 May 2012), Composite Warfare and The Amphibians (pdf), Marine Corps University, pp. 9–24 
  5. ^ Shorter OED

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Maritime_geography — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
33789 videos foundNext > 

The Waves of Containerization: Shifts in Global Maritime Transportation

Jean-Paul Rodrigue received a Ph.D. in Transport Geography from the Université de Montréal (1994) and has been a professor at Hofstra University since 1999...

Maritime man promoting the reeducation of geography education

Sat, Jan 4: Is the long time subject of geography becoming an afterthought, because of the internet? A Maritime man is sinking money into a foundation promot...

Pacific Maritime Ecozone Advertisement Geography Project

Geography Eco zone project about Pacific Maritime in Canada.

atlantic Maritime ecozone geography

grade 9 geography assignment.

Geography project ~ pacific maritime

my geo project.

Pacific Maritime Ecozone

Geography assignment on the Pacific Maritime Ecozone. Rate, Comment, Subscribe.

Atlantic Maritime Ecozone.wmv

The journey of two studens from Greenwood School to Atlantic Maritime Ahmed Ali and Ilgowan Choi Geography assignment.

Lawson Brigham - "The New Maritime Arctic"

Lawson Brigham, a distinguished professor of geography & arctic policy at the University of Alaska, Fairbanks, presented a public lecture titled, "The New Ma...

Daniel Dundee- Atlantic Maritime

Daniel Stern as Daniel Dundee in this hilarious geography project presentation of the Atlantic Maritime ecozone. filmed by Zach Engel (zachtheman87) Special ...

Come to the Pacific Maritime Ecozone Today!

Grade 9 Geography Project.

33789 videos foundNext > 

2 news items


Tue, 21 Oct 2014 06:32:37 -0700

Located west of Istanbul, on the European side of the country, the Thrace region benefits from its proximity to Istanbul's population as well as its pivotal maritime geography: the Black Sea, the Sea of Marmara, and the Aegean Sea all border and ...

The Diplomat

The Diplomat
Thu, 16 Oct 2014 22:37:30 -0700

As a natural consequence of the maritime geography and complex array of security challenges within, naval modernization programs in Southeast Asia have always been characterized by the quest for a balanced set of capabilities. They not only reflect ...

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!