My mom in an immigrant from Saudi Arabia. She tells me how bit it is, apparently it's the fifth largest state in Asia!
Is that by area or population?
Geographically! It is isolated from Egypt and Israel by the Gulf of Aqaba.
Do they have a large population?
I don't know, by they way she describes it they do! The kingdom was founded in 1932 by Inb Saud. 
What are some sites to see there?
It is boarded by the Red Sea cost. That is quite nice. Also the Persian Gulf coast is worth checking out.
That sounds really neat. I bet it is beautiful.