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In many copies of Geography Challenge XXII on Nov. 11, the map appearing with the “State secret” question was more mysterious than intended. Because of technical problems, nothing was highlighted on the map. For the many readers who unfairly drew a blank on this, we’re repeating the map and the question.

State secret

What do the 31 states highlighted have in common?

GEOCHALLENGE ANSWER

For those who got the blank map last week, here’s the answer:

State secret

All drain — at least in part — into the Mississippi River or its tributaries.