Ad-Dahna Desert passages which can be several kilometers long. Local Bedouin have always known these caves and some were used as water supplies. They were first systematically studied in the 1981, and later explored and reported by the Saudi Geological Survey. Ad-Dahna Desert The ad-Dahna Desert is the central division of the Arabian Desert. It is a corridor of sandy terrain forming a bow-like shape that connects an-Nafud desert in the north to Rub' al-Khali desert in the south. Its length is more than 1,000 km siding Twaik Mountains from the east and does not exceed 80 km in width. It is
Incense Route – Desert Cities in the Negev Incense Route – Desert Cities in the Negev Incense Route – Desert Cities in the Negev is a World Heritage-designated area near the end of the Incense Route in the Negev, southern Israel, which connected Arabia to the Mediterranean in the Hellenistic-Roman period, proclaimed as being of outstanding universal value by UNESCO in 2005. The trade led to the development of ancient towns, forts and caravanserai en route, apart from agricultural development. Four towns in the Negev Desert, which flourished during the period from 300 BC to 200 AD, are linked directly with the Mediterranean terminus of both the Incense