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A high, fortress-shaped mountaintop with a brushy pine tree in the foreground and a low flat desert landscape in the far distance beyond the peak

Clue 1: This national park is named for a prominent large-scale landscape feature associated with a western river.

Clue 2: The high Chisos Mountains are at the heart of this park located in the Chihuahuan Desert of Texas.
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Last modified: 6/20/2008