Mexico & Canada are adjacent to the US: Next to. Spain, Andorra, Belgium, Luxembourg, Germany,Switzerland & Italy are all adjacent to France. Countries which border each other.
Transylvania is not a country but a province in the Central Romania; countries adjacent to Romania are: Bulgaria, Moldova, Ukraine, Hungary, Serbia.
Pakistan, China, Myanmar, Bhutan, Srilanka and Nepal
Peru is southeast neighbour of Ecuador.
The US only, to the south