Guess the map....
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No peeking...
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Places stoned people fell off of boats?
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I think it’s a map of the British Isles and Western Europe with the waterways in between and some pink spots.
What do I win?
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Well done everybody in avoiding Dutch dyke jokes.
Spitfires is the closest. It's unexploded bombs.
Sadly, German engineering being what it was, they frequently still work.