 The largest concentration appears to be in the Harrat al-Shamah, a black basalt desert, stretching south and east from Jabal al-Druze through Jordan and into Saudi Arabia.Approximately 30,000 inscriptions have been recorded, although doubtless many hundreds of thousands more remain undiscovered due to the remoteness and inhospitable nature of the terrain in which they are found.Typically the inscriptions are found on the rocks and boulders of the desert scatter, or on the stones of cairns.