Though governed by separate countries, the cities of El Paso, Texas, and Juárez, Mexico, merge into an apparently seamless metropolis in this satellite image. Acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite on October 15, 2008, this false-color image shows a cityscape straddling the Rio Grande, the river that divides the United States an Mexico.

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