The oases of Buraydah and Hayil are in the northern part of Najd.

The oases of Buraydah and Hayil are in the northern part of Najd. Al-Hasa or the Eastern Province is on the Persian Gulf. All the oil and gas of the kingdom are found in this province. It also has the important oases ofHofuf and Qatif. The leading commercial centers of the province are Al-Khobar and the port city of Dammam. Other important cities are Dhahran and Ras Tanura.

The Ruba'-al-Khali (the Empty Quarter) in the south is the largest continuous body of sand in the world, and covers an area of 250,000 square miles. To the Arabs, it is known simply as “Ar-Ramal” (the Sands). It is an almost lifeless desert, and is one of the most isolated and desolate regions of the world. An-Nufud in the north of the peninsula is the second largest…