Pakistan shares its longest border with which country?

Pakistan shares its longest land border with Afghanistan, known as the Durand Line. This border stretches approximately 2,430 kilometers (1,510 miles) and has historically been a point of geopolitical significance.

• Afghanistan (Correct): The Durand Line forms the extensive border between Pakistan and Afghanistan, making it the longest.
• China (False): Pakistan shares a border with China in the north, but it is significantly shorter than the border with Afghanistan.
• Iran (False): The border with Iran is also substantial but not as long as the one with Afghanistan.
• Tajikistan (False): Pakistan does not share a direct border with Tajikistan; the Wakhan Corridor of Afghanistan separates them.