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DEL NORTE GAP. The Del Norte Gap, or Paso del Norte, is a pass separating the Santiago Mountains to the south and the Del Norte Mountains to the north nineteen miles southwest of Marathon in central Brewster County (at 30°00' N, 103°27' W). With an elevation of 4,350 feet above sea level, the gap is 800 to 1,200 feet below the mountains on either side. The Del Norte Gap has been used for centuries. An unimproved road has traversed it at least since the 1940s. In the area, shallow, stony clay loams support juniper, oak, grasses, chaparral, and cacti.

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"DEL NORTE GAP," Handbook of Texas Online (, accessed November 30, 2015. Uploaded on June 12, 2010. Published by the Texas State Historical Association.