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
Tanami Desert is classified as an interim Australian bioregion, comprising . According to government commissions, the Tanami desert is uniquely "one of the most important biological areas to be found in Australia particularly as it provides refuge for several of Australia's rare and endangered species." The species that are found include: Significant bird species include: There are several mines in the Tanami Desert including: The Tanami Desert is a Kukatja and Walpiri country. The Tjurabalan live at the edge of the desert. In July 2012, of the desert area (38% of the total bioregion) was declared an indigenous protected area or conservation