Hint - It means that every citizen in the country is required to he Muslim. Non-muslim residents can follow their religion in private but not in public. Saudi Arabia is the largest country in Southwest Asia in area.
Complete answer - It is such a dry state in the world, where large reserves of petroleum and natural gas are found. This is their main source of income. The southern and southern-eastern part of the Arabian Peninsula, that is, the adjacent part of the Persian Gulf is the most important area of petroleum. The Sinai Peninsula and the Mediterranean coastline are also famous for oil production. South-West Asia makes oil and natural gas available in the international market, from which it gets 'Petro Dollar'. After the formation of OPEC (Organization of the Petroleum Exporting Countries), it has become an area capable of influencing the international market. Most of the countries of South-West Asia are allied countries of the United States and large oil companies have invested huge capital here. The International North - South Transport Corridor is the proposed sea, rail and roadway for goods traffic between India, Russia, Iran Central Asia.
Saudi Arabia is the largest country in Southwest Asia in area. It covers about 80% of the area of the Arabian Peninsula. It is a completely democratic country. Its capital is Riyadh. Its interior is a plateau, with mountainous regions on its western border. In the southern part is the largest sand desert in the world, which is called 'Rab-al-Khali', while in the northern part 'Al-Nafood' desert is found. Mecca's gate 'Jeddah' has been included in the UNESCO World Heritage List. Sharjah is famous for the cricket ground, while Dubai is a famous commercial center. Jeddah is the largest port and airport in West Asia. Haj pilgrims from different parts of the world descend here and go to Mecca. In order to be self-sufficient in food grains, fruits and vegetables, irrigation expansion plans are going on here and in the event of losses, cultivation is done so that during any crisis or war, no country can make food items weapons against it. Saudi Arabia ranks first in the world in the storage and export of mineral oil, while in production is second only to Russia. Despite the high economic income, the level of human development and especially gender-based human development is very low here. 17 km from Abu Dhabi, the capital of 'United Arab Emirates' (UAE). Located at a distance of, the city 'Masdar' is not only counted among the major smart cities of the world, but it is also the world's first 'zero carbon' city.
Note - Seven Arab Emirates are included under the United Arab Emirates - Abu Dhabi, Dubai, Sharjahan, Al Ain, Ras-al-Khamikh, Azman and Hujirah. Its capital is Riyadh. Its interior is a plateau, with mountainous regions on its western border.