Maritime geography
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Maritime geography is often discussed in terms of four loosely-defined regions: Riverine, brown water, green water, and blue water.
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[edit] Regions
[edit] Riverine
The riverine environment consists of all navigable rivers of interest.
[edit] Brown water
The brown water environment consists of the littoral areas, from the coast and estuarial areas to perhaps a hundred miles from shore. It is the most important maritime arena, including all coastal traffic and territorial waters, in which are found the great majority of a nation’s maritime police, customs, environmental, and economic concerns.
A "brown water navy" focuses on coastal operations and primarily takes a defensive role.
[edit] Green water
The green water environment extends from the outer edge of the brown-water zone past any continental shelves, archipelagos and islands; perhaps a thousand miles from shore.
A "green water navy" is capable of defense of its nation in depth and is a significant offensive force within its territory.
[edit] Blue water
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.
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