Chang’s is around 250-300 miles North of Las Vegas.  As for graboid incursions, the Perfection graboids were hemmed in by rocks and mountains, but theoretically graboids can exist in any sandy desert if ABs can find the right places to lay eggs, so a Primm take-over is not out of the question.  We have implied that graboid eggs need a warm environment, like that provided by hot springs, so they are somewhat limited in where they can hatch.

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