During the 19th century British military expeditions, the 1980s Soviet occupation, and the latest conflict, Kunar has been a favoured spot of insurgent groups. Its impenetrable terrain, cave networks and border with the semi-autonomous Pakistani Khyber Pakhtunkhwa provides significant advantages for unconventional warfare and militant groups. The province is informally known as "Enemy Central" and "Indian Country" by Western armed forces serving in Afghanistan. Between January 2006 and March 2010 more than 65% of all insurgent incidents in Afghanistan occurred in Kunar province.