Yay? How about canals being buildable/destroyable?
note since you have access to the MAPX file some could remain deep rivers such as the suez, but this would be preferable for lock based dams.(the Panama being the most prolific of those)
(pre-emptive strike "Oh its that guy again"

)
Let us not forget that the japanese End game plan involved destroying the panama.

Oh wait you did? um well no dont

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Si vis pacem, para bellum
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