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The Arabian Peninsula
The largest peninsula on Earth, and it has no rivers
Water, not oil, is the scarcest thing here. The Arabian Peninsula is the largest peninsula on Earth, some 3.2 million square kilometers of it, a great tilted slab of the Arabian plate that tore away from Africa and is still grinding northeast into Asia. It has no permanent rivers at all. Rain that falls on the mountains of Yemen and Oman runs into wadis and vanishes; the interior is desert, including the Rub al-Khali, the Empty Quarter, the largest continuous sand sea in the world. That some 95 million people now live here, much of the population in air-conditioned cities along the Gulf, is a feat of engineering, desalination and hydrocarbon wealth.
The peninsula tilts: high ground along the Red Sea in the west, sloping gently east to the shallow Persian Gulf. The Sarawat range runs down the western edge and culminates in Yemen at Jabal an-Nabi Shuayb, 3,666 meters, high and wet enough for terraced coffee. The Arabian Desert fills the interior, and the two should not be conflated — the desert is the peninsula's core, not the whole of it, since the Hajar Mountains of Oman, the monsoon-touched hills of Dhofar and the coastal plains all lie outside it. Saudi Arabia occupies most of the landmass, with Yemen, Oman, the United Arab Emirates, Qatar, Kuwait and Bahrain arranged around the rim.
Frankincense caravans and the pilgrimage to Mecca made the peninsula a crossroads long before anyone drilled a well. Islam began here in the seventh century, and its holiest cities remain here, drawing millions of pilgrims a year. The discovery of oil in the 1930s rewrote everything: fishing and pearling towns grew into Riyadh, Dubai, Doha and Abu Dhabi, built substantially by migrant labor from South Asia, who form a majority of the population in several Gulf states. The wealth is unevenly spread — Yemen, the most populous corner after Saudi Arabia, has endured war and famine. With oil demand expected to peak, the Gulf states are betting heavily on tourism, finance, logistics and solar power.