The crossword solution for the term 'Nation on the Gulf of Oman' is IRAN, which is a country located in Western Asia. It is bordered by Iraq to the west, Turkey to the northwest, Armenia to the north, Azerbaijan to the northeast, Turkmenistan to the east, Afghanistan and Pakistan to the southeast, and the Persian Gulf and the Gulf of Oman to the south. IRAN is the 18th largest country in the world and has a population of over 81 million people.