The 5 Keys That Lock Up The World

 

1. Singapore
2. Cape Of Good Hope
3. Alexandria
4. Gibraltar
5. Dover

* The above is apparently from 1905; I have been unable to find a contemporaneous source but the scan below is taken from THE PAPERS OF ADMIRAL SIR JOHN FISHER, Volume 1, Edited by Lieutenant-Commander P.K. Kemp, published by the Navy Record Society, London, (1960).

In September 2022, writing in The London Review Of Books, Tom Stevenson said the modern equivalents are Malacca, Yokosuka, Hormuz, Suez and Panama.

 

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