Several borders show untapped promise—zones we classify as Challenger archetypes. These include the Benin–Togo, Chad–Niger, and Mali–Burkina Faso frontiers. Each is marked by persistent insecurity, ...

A satellite image of Hkakabo Razi, the tallest peak in Myanmar. Credit: NASA, Landsat 8 ETM + Subscribe for ads-free reading.

Officals in Niger say armed men have killed 34 soldiers in western Niger near the tri-state border with Mali and Burkina Faso ...

The design for a section of the border wall that will span Southern Arizona’s San Pedro River is coming to light, more than a year after a contract was awarded to build it. The plan is to build ...

Federal officials rectified an oversight in border wall construction Tuesday after a sharp-eyed wildlife advocate noticed the gates in the wall across the San Pedro River were welded shut.

Insurgents are expanding from West Africa’s Sahel region toward Atlantic coastal nations such as Ivory Coast, creating new ...

BAMAKO, Mali — Extremists have killed dozens of soldiers ... The attack on Sunday on the base in Boulkessi, near the border with Burkina Faso, killed at least 60 soldiers and wounded 40 more ...

Researchers have found that pollutants in the Tijuana River, which carries raw sewage and industrial waste from Tijuana, are also turning up in the air along the coast near the U.S.-Mexico border.

While Donald Trump has issued a sweeping call for mass evacuation from Tehran, signalling the spectre of an all-out regional ...