https://www.rawstory.com/2018/01/biggest...d-terrain/
Quote:Biggest hurdle for Trump’s border wall is remote, rugged terrain
Quote:Texas shares more than 1,200 miles with Mexico, but only 110 miles of that is fenced. Much of the rest is either private property or protected public lands, such as steep cliffs at Big Bend, marshes at the Santa Ana National Wildlife Refuge or the braided channel of the Rio Grande as it empties into the Gulf of Mexico.