The Persian Gulf.
The Persian Gulf
All of the Gulf countries are "oil rich" -Possibly Saudi Arabia most.
Rich and unhappy.
what 4 countries are the most oil-rich in the southwestern Asian region
The fertile crescent
To prevent Iraq from conquering its oil-rich neighbors
You are likely referring to the Persian Gulf, but the description also suffices for the Gulf of Oman.
This question would seem to be asking about the Persian Gulf. The gulf is part of the Indian Ocean and the lands surrounding it contain rich petroleum reserves.
Because of it's key position in the middle of the oil-rich Southwest Asia.
The Persian Gulf countries are 7 in total: Iran, United Arab Emirates, Oman, Bahrain, Qatar, Saudi Arabia, and Kuwait. All are rich in oil and oil reserves. Iraq, while also rich in oil and oil reserves, has never been a Persian Gulf State. Located in the Middle East, the Persian Gulf States, produce about one-fifth of the total world oil production. They have more than half of the world's oil reserves.
Between Saudi Arabia and Africa is the Red Sea. South of Saudi Arabia is the Gulf of Aden and the Indian Ocean. Between Saudi Arabia and India is the Arabian sea The Mediterranean Sea north-west of Saudi Arabia but there are places such as Iraq and Syria in-between. Hope this helps.