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The National Parks Traveler\\u2019s Lynn Riddick begins a two-part series about her recent trip to Big Bend -- a vast wilderness in the Chihuahuan Desert along the Rio Grande. She meets up with the park\\u2019s chief of interpretation, who offers an overview of the park\\u2019s varied geology and diverse ecology, its human history and what the future may hold for visitors seeking adventure and solitude in the park\\u2019s 800,000 acres.