Majlis al Jinn

'meeting/gathering place of the Jinn') is one of the ten largest[1] known cave chambers in the world,[2] as measured by the surface area of the floor.

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.

The cave was formed in fossiliferous carbonate rocks of the Middle Eocene Hadhramaut Group, Dammam Formation.

[4] Water entering the cave collects along the lowest part of the floor, then slowly infiltrates into the fine-grained, mud-cracked sediment or evaporates.

The entrances receive surface runoff from only a small drainage area, so water never reaches most parts of the cave.

Access to the cavern is only through a free descent of one of three vertical entrances in the ceiling, formed by water seeping through the weakened marly limestone in the zones of fracturing.

Cavers entering Majlis al Jinn require about 200m of specialized rope and equipment to descend and ascend safely.

[11] In 2014, rock climbers Stefan Glowacz and Chris Sharma abseiled into the cave and climbed out via a very steeply overhanging route up the inside of the dome, which they claimed as the world's largest unclimbed roof.

The map and cross sections they created, as well as photos, were originally published in the special PAWR report and have been reproduced many times since.

[5] Majlis al Jinn was included in a story in the April, 2003, issue of National Geographic Magazine.