Editing Geography of Saudi Arabia (section)

== Caves ==
Beneath the harsh deserts of Saudi Arabia lie dark chambers and complex mazes filled with crystalline structures, [[stalactite]]s and [[stalagmite]]s. The limestone floor of the Summan plateau, a [[karst]] area to the east of the Dahna sands, is riddled with such caves, known locally as ''dahls''. Some have tiny entrances which open into caves, others lead into a maze of passages which can be several kilometers long. Local Bedouin have long known of these caves, and some were used as water supplies. They were first systematically studied in 1981, and later explored and reported by the [[Saudi Geological Survey]].