Translation of naturalization in Spanish

The airport was huge, compared to Siem Reap's one, of course. We expected something similar to Bangkok's airfield but it was completely different. We stood in line for the passport control.
In the end we decided to try something new, and although we are not great "fans" of South East Asia, we agreed on going to Thailand, Cambodia, Vietnam and if there would be enough time Hong Kong.
We first took a regular bus to the border, which was basically just an empty building. There we switched to Jeeps, as the terrain was rocky. In our group there were 4 American girls and us.