Sea lines of communication

China's Critical Sea Lines of Communication. In 2004, over 80 percent of Chinese crude oil imports transited the Straits of Malacca, with less than 2 percent transiting the Straits of Lombok. Click to enlarge. See also: China's String of Pearls

Sea lines of communication (abbreviated as SLOC) is a term describing the primary maritime routes between ports, used for trade, logistics and naval forces.[1] It is generally used in reference to naval operations to ensure that SLOCs are open, or in times of war, to close them.

In the American Revolutionary War and the Napoleonic Wars, the SLOCs were, for the most part, in the control of the British Navy. When the British lost control of them during the Revolution, the result was the fall of Yorktown and its biggest army and, ultimately, the war. In the Napoleonic era, maintaining belligerence throughout, the British embargoed and blockaded any country associated with Napoleon, which created large economic hardships and dislocations that ultimately led to the people of France becoming disenchanted with Napoleon.

In World War I and World War II, the British and Germans declared mutual blockade and the Kriegsmarine attempted to close the SLOCs from North America to the British Isles with the use of submarines. In each case the Allies succeeded in keeping the sea lanes open. The Germans in each case failed to defeat the British naval blockade of Germany.

The United States Navy in World War II successfully closed the SLOCs to Japan, strangling the resource-poor island nation.

The importance of SLOCs in geopolitics was described in Nicholas J. Spykman's America's Strategy in World Politics published in 1942.

Had the Cold War turned hot, Europe would have required resupply and reinforcement from North America. Soviet Navy strategy was to close the SLOCs to maximize their numerical superiority in Europe.

See also


  1. ^ "Global commerce and sea lines of communication in the Indian Ocean: A Sri Lankan perspective". FT. April 10, 2019. Retrieved September 23, 2020.

This page was last updated at 2020-12-15 16:31, update this pageView original page

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