The Potomac is in DC, MD and VA.
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SOME HISTORY TRIVIA: In the 1600s American settlers along the Potomac were having problems with pirates and appealed to the British for assistance.
The British Navy came in and mapped out the entire waterway in the course of eradicating the pirates.
150 years later, they used those maps to attack Washington and burn the WH.
Demonstrates the value of intel.
Well, I’m thinking Near the White House as possible, although I am sure that they have someone checking the boats in that area.