I read that there is some old old document or decree or something that will always deny Virginia any ownership of the Potomac River. I was curious as to what exactly that is, and why it exists.|||The Potomac River divides Maryland and Virginia, but Virginia does not own half of the Potomac River. The line separating Maryland from Virginia is not in the middle of the river. The Maryland-Virginia boundary is on the far southern edge of the river, next to the Virginia shoreline.

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