1. China:
- Vietnam shares a northern border with China, which is approximately 1,281 kilometers (800 miles) long.
2. Laos:
- Vietnam also has a western border with Laos, which stretches for about 2,130 kilometers (1,324 miles).
3. Cambodia:
- Vietnam's southern neighbor is Cambodia. Their shared border is around 1,228 kilometers (763 miles) long.