>>> What city is the Red River Rivalry takes place in? 

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The Red River Rivalry takes place in Dallas, specifically at the Cotton Bowl. This is a "neutral site" game, meaning that it is not held in either Texas or Oklahoma, but rather in a location that is roughly equidistant between the two states. The Cotton Bowl has been the home of this rivalry since 1937, and it has been held there annually ever since, making it one of the longest-running sporting events in the United States.