Neighbors

http://commons.wikimedia.org/wiki/File:Wakhan.png
Image: Wikimedia Commons

China and Afghanistan share a border. The Wakhan Corridor, a slender panhandle only 40 miles wide, reaches between Tajikistan and Pakistan to touch Afghanistan’s eastern border.

Because China does not use conventional time zones, that border requires the greatest time change of any international frontier — travelers must reset their watches by 3.5 hours.