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The country that is at Saudi Arabia's southeastern corner is OMAN.
Yes. There are swordfish in the Red Sea waters on Saudi Arabia's western coast.
All of the Gulf countries do share a border with Saudi Arabia (except the island of Bahrain which is off of the Saudi coast), but there is no "requirement" that Gulf countries border Saudi Arabia.
saudi arabia
Iran is east off the eastern coast of Saudi Arabia, but between Saudi Arabia and Iran lies the island-nation of Bahrain.
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Bahrain is located off the coast of Saudi Arabia in the Persian Gulf.
Saudi Arabia is likely more worried about Iran because Iran's Shiite Islamism makes Iran an intractable enemy. Saudi Arabia knows that as long as they monetarily support Islamic State that they can push off direct confrontation.
The ruler of the Kingdom of Saudi Arabia is King Abdullah ibn Abdul Aziz Al Saud. Recent news is a major stimulus package worth US $35 billion to improve the lot of his people (and perhaps stave off the revolt sweeping the Arab world)
Seven of those countries are in the Arabian Peninsula: Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, United Arab Emirates and Yemen.
Saudi Arabia is known for enforcing strict Islamic law, including amputating the hands of convicted thieves. However, the actual practice of this punishment may vary in different regions within the country.