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According to our new map, there are 700 miles of fence along the U.S.-Mexico border –
a Customs and Border Protection spokeswoman recently said the total is 702, so our
tally is very close to the agency’s. However, in some high-traffic spots, there are two or
three layers of fence in one place, leaving somewhere between 652 and 690 miles of the
border actually covered by fence.

https://www.revealnews.org/article/the-wall-building-a-continuous-u-s-mexico-barrier-would-be-a-tall-order/

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Color indicator for the above map

The U.S.-Mexico border fence system today. Pedestrian fence
is colored dark orange, vehicle fence in light orange.