China and Russia have the largest number of international borders. Both have 14 neighbouring countries.
The neighbouring countries of China include Mongolia, Russia, Kazakhstan, Pakistan, Afghanistan, Tajikistan, Kyrgyzstan, Bhutan, Nepal, India, Myanmar, Vietnam, Laos, and North Korea.
The neighbouring countries of Russia include Ukraine, Belarus, Latvia, Estonia, Finland, Norway, North Korea, China, Georgia, Mongolia, Azerbaijan, Kazakhstan, Lithuania and Poland.