The Arabian Peninsula, or simply Arabia is a peninsula of Western Asia situated northeast of Africa on the Arabian plate. From a geographical perspective, it is considered a subcontinent of Asia.
It is the largest peninsula in the world, at 3,237,500 km2 (1,250,000 sq mi). The peninsula consists of the countries Yemen, Oman, Qatar, Bahrain, Kuwait, Saudi Arabia and the United Arab Emirates. The peninsula formed as a result of the rifting of the Red Sea between 56 and 23 million years ago, and is bordered by the Red Sea to the west and southwest, the Persian Gulf to the northeast, the Levant to the north and the Indian Ocean to the southeast. The peninsula plays a critical geopolitical role in the Arab world due to its vast reserves of oil and natural gas.
Before the modern era, it was divided into four distinct regions: Red Sea Coast (Tihamah), Central Plateau (Al-Yamama), Indian Ocean Coast (Hadhramaut) and Persian Gulf Coast (Al-Bahrain).
Hejaz and Najd make up most of Saudi Arabia. Southern Arabia consists of Yemen and some parts of Saudi Arabia (Najran, Jizan, Asir) and Oman (Dhofar). Eastern Arabia consists of the entire coastal strip of the Persian Gulf.
According to en.wikipedia