Remarkable Photographs of International Borders

To many, international borders are reminders of snaking lines at customs, security-laden checkpoints or even an enigmatic line drawn on a map but never visibly seen but according to these images, what separates one country from another may be as easy as simply walking across the street, crossing a river, or in Spain and Portugal’s case, ziplining over a waterway. In some cases, the landscape itself provides a remarkably stark geological contrast between two countries and quite a fascinating sight to see from above.