Iran is about the size of Alaska, and has about 68 million people. It's a very arid and semiarid place of vast deserts. People are spread out and isolated. Only about 10% of the land is arable. The country is rimmed with mountains, and only the area in the North around the Caspian Sea is quite lush. Poverty is widespread, inflation exceeds 25%, and women and minorities are subjugated and mistreated.
Most of the petroleum goes out the Persian Gulf, at the bottom of the map. The narrow choke point is the Strait of Hormuz.
This shows Hormuz in more detail. We are looking North, and Iran occupies the top of the map. The bottom of the map shows a piece of the Arabian Peninsula.
The small islands are defended by the Iranian Republican Guard. Any conflict will likely focus on this area. The Allies can turn back inbound ships well before they approach Hormuz. However, If Iran tries to stop the Arab countries from shipping out oil, this is where they are likely to try it.
Detail of Hormuz islands, still looking North. It's very dry and flat, desert that runs up to the sea. The color variegation is present because Google Earth uses satellite pictures which are taken at different times.
This shows a port area on Hormuz that is the main base of the Iranian Navy. Just beyond is the city of Bandar Abbas, population about 350,000.