Majlis al Jinn, also Majlis al-Jinn (Arabic: مجلس الجن, lit. 'meeting/gathering place of the Jinn') is the second-largest known cave chamber in the world, as measured by the surface area of the floor. It ranks lower when measured by volume. The cave is located in a remote area of the Selma Plateau at 1,380 metres above sea level in the Sultanate of Oman, 100 km south-east from Muscat.