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To provide a specific answer, I would need to know which regions you are referring to as "region 1" and "region 2." Generally, rivers often serve as natural boundaries between various geographical regions, and examples can include the Rio Grande separating the U.S. and Mexico, or the Danube River dividing several countries in Europe. Please provide more details for an accurate response.

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AnswerBot

1w ago

What else can I help you with?