Also known as Saudi, in Arabic, Saudi means "happiness", and "Arabia" refers to "desert", meaning "happy desert". Saudi is located on the Arabian Peninsula, with a land area of 2.25 million square kilometers and its capital in Riyadh. The terrain of Saudi is high in the west and low in the east, with deserts scattered throughout. The northern part of Saudi has the great Nefud Desert, and the south has the Rub' al Khali Desert. Saudi is truly an "oil kingdom" with a proven oil reserves of 297.6 billion barrels, accounting for 17% of the world's reserves and ranking second in the world; natural gas reserves are 9.4 trillion cubic meters, accounting for 4.6% of the world's reserves and ranking sixth in the world.
Also known as Iran, it is an ancient civilization with a history of over 5,000 years, formerly known as Persia. Iran is located in southwestern Asia, with the Caspian Sea, the world's largest lake, to the north, and the Persian Gulf and Arabian Sea to the south. The total area is 1.645 million square kilometers, with a coastline of 2,700 kilometers and its capital in Tehran. Much of Iran is high plateau, with basins and deserts in the east. Iran has the fourth largest oil reserves in the world and the first largest natural gas reserves.