It depends what you mean by "city-state". If you are referring to Emirates (Arab Tribal Principalities), then the largest in area is Kuwait, which sits on the Persian Gulf.
If you are talking about historic city-states, there are several historic city-states in the Mesopotamian valley, like Akkad or Sumer. Additionally, as the Persian Gulf lies between modern day Saudi Arabia and Iran, the closest Ancient Greek city-state would have been Knossos, where the Mycenaean Greeks lived.
The Persian Gulf.
That is Iran
Arabian peninsula
The Persian Gulf :)
Persian Gulf.
Persian Gulf.
That is the Arabian Peninsula.
Persia, today called Iran.
Not in, but the UAE borders the Arabian (or Persian) Gulf which is a shallow sea
The body of water separating Iran from Saudi Arabia is called the Persian Gulf. There has been a push by the Arabs to have the Gulf renamed the Arab Gulf (as it is called "al-Khalij al-3arabi" in Arabic). No non-Arab nation has adopted this nomenclature.
The State of Kuwait is on the northwestern shore of the Persian Gulf. Kuwait is located in the northeastern part of the Arabian Peninsula. Kuwait consists of the mainland on the peninsula as well as nine nearby islands.
There is no such thing as the "Chadian Sea".