A rocky peak in Yemen that forms part of a mountain range between Marib and Bayhan al Qisab, used over the centuries as a hideout for smugglers, criminals and terrorists. Not always successfully: in 1992, a CIA plane blew up a truck carrying al-Qaeda operatives through the area. The Marib province sits on the southern edge of the Rub’ al-Khali, or Empty Quarter. The world’s largest sand desert, the Rub’ al-Khali covers around a fifth of the Arabian Peninsula and stretches into four countries: Saudi Arabia, Oman, Yemen and the United Arab Emirates (UAE). The entire desert is larger than mainland France, measuring around 583,000 square kilometres, and contains about half as much sand as the Sahara, despite being only around 1/15th of its size (this is due to the fact that the Sahara is largely made up of rocks and gravel). Summer temperatures in the Rub’ al-Khali can peak at more than 55°C in the shade, and the little rain that does reach the desert tends to fall erratically, meaning that some areas can go for several years without any precipitation.
Wind blowing from multiple directions has created these star dunes at Ramlat Fasad on the Yemen–Oman border. Unlike other dunes, star dunes grow upwards rather than sideways, and consequently can grow to be some of the highest in the world.
Star dunes spread out like fingers in the remote Omani part of the Rub’ al-Khali near Wadi Mitan. Although sand is the predominant feature of the Rub’ al-Khali, the desertscapes range from fine, soft sand and altitudes of up to 610 metres in the west to the east’s salt-encrusted mud flats, which are notoriously difficult to drive across. Star dunes tend to occur on the edges of sand seas, and in the Rub’ al-Khali are largely found in the east and south of the desert, where they can grow to a height of 200 metres.
Chains of static star dunes form ridges tens of kilometres long, parallel to the predominant wind direction, in the Uruq al Mutaridah, Saudi Arabia. The Rub’ al-Khali is believed to have formed around two million years ago, its sands originally ground down from volcanic highlands and dry seabeds. However, more recently (from around 37,000 to 17,000 years ago, and from 10,000 to 5,000 years ago) small lakes formed on its surface following heavy rains, and fossils show that these temporarily hosted animals such as hippopotamuses and water buffalo. Although the landscape today appears to be devoid of life, numerous well-adapted plants and animals can be found throughout the region. Among them is the oryx, a type of antelope that can survive for several months by licking up the morning dew it finds on plants when free water is unavailable.
Star dunes in Ramlat Fasad on the Yemen–Oman border. Although there are no permanent settlements in the centre of the Rub’ al-Khali, Bedouin tribes have lived around its edges for thousands of years, historically trading camels and frankincense. The desert remained largely unexplored by Europeans until the 20th century, when Englishman Bertram Thomas completed the first crossing in 1931.
An unusual collection of dot-shaped dunes spreads across the plain of Wadi Hazar in the Yemeni part of the Rub’ al-Khali. It appears that a change in wind direction has blown the crescent tails from a field of so-called barchan dunes. Barchans are crescent-shaped dunes formed on relatively hard desert floors where there is a limited supply of sand and a strong prevailing wind. They can grow to a metre in height within just a few hours and move up to 100 metres per year, with smaller dunes often catching up to and overtaking larger ones.
Dressed in black cloaks (abayas) and straw sun hats (nakhls), local women harvest wheat in Yemen’s Hadramawt Valley, where a series of spring-fed agricultural towns are bordered by 300-metre-high red cliffs. The valley was historically on one of the frankincense routes used to transport the perfumed resin to the coast. It was dotted with walled cities made of mud, including Shibam, which is now a UNESCO World Heritage site and contains numerous mud ‘skyscrapers’. For centuries, farming and frankincense trading were the predominant industries in and around the Rub’ al-Khali, but in 1948, the Al-Ghawar, one of the world’s largest oil fields, was discovered in Saudi Arabia, altering the traditional lifestyles of many of the people living on the desert’s fringes.
A vertical view of a herd of camels crossing the sandy gravels of the Empty Quarter on their way to graze near Wadi Mitan in western Oman. Many of the females having bra-like coverings over their udders to keep their young from nursing until they have returned to camp for milking.
A field being drip irrigated at Liwa, in the UAE. The aquifers in Liwa, used to water date crops, are rapidly drying up, and areas that once had water three metres underground now require wells more than 75 metres deep, while elsewhere, huge sinkholes have appeared.
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