Several countries have only one land neighbor, depending on how "neighbor" is defined (land border versus maritime borders). There isn't one single answer. Let's examine some examples:
Countries with One Land Neighbor (Enclaves)
Several countries are enclaves, meaning they are completely surrounded by another country. These countries only have one land neighbor:
- Lesotho: Completely surrounded by South Africa. Source: Wikipedia
- San Marino: Completely surrounded by Italy. Source: Wikipedia
It's important to note that the Vatican City is also an enclave within Rome, Italy, but it's generally not considered to have a neighboring country.
Countries with Primarily One Land Neighbor (Other Cases)
Other countries might primarily interact with only one land neighbor due to geographical features but might still have maritime borders with other countries. This can lead to ambiguity in the answer.
Conclusion
The question needs clarification to specify whether the focus is on land borders exclusively. Several countries have a single land neighbor, but the definition of "neighbor" influences the final answer.
