View from Coronado Peak, at Coronado National Memorial in Cochise County, Arizona. 

In the foreground is Yaqui Ridge in the United States. Everything beyond is in Sonora, Mexico. If you click to enlarge the image, a portion of the current border wall can be seen left of Yaqui Ridge. This section of wall, constructed in the early 2000s, is about 17 feet tall (5 m).