the Red Sea.
The Red Sea my good man.
Saudi Arabia is bordered by Yemen, Oman, UAE, Qatar, Kuwait, Iraq (including part of the border with ISIL), and Jordan. Israel, Egypt, and Bahrain are close to Saudi Arabia, but across a thin body of water.
There are no permanent bodies of water in Saudi Arabia.
The Persian Gulf borders Saudi Arabia to its southwest.
Persian Gulf
The Red Sea.
Egypt, Israel, Jordan, Saudi Arabia, and Yemen are the countries that border the Red Sea. However, if the Gulf of Aqaba is not considered part of the Red Sea, then Israel and Jordan should be removed from the above list.
To travel directly from Iran to Saudi Arabia you would cross the Persian Gulf
The Red Sea separates Africa from Saudi Arabia.
euphrat
red sea
Red sea