Pandemonium

Pandemonium is the land of chaos and darkness. It contains absolutely no natural light, and is instead an unfathomably huge web of rocky tunnels. The tunnels are jumbled and chaotic, constantly taking strange shifts in direction. Even worse than the terrain itself, however, is the weather: Pandemonium is constantly assaulted by extremely powerful winds. The winds are so strong that, across the entire plane, it is only possible to converse if you are within 10 feet of each other and screaming. Nonmagical flames are also extinguished almost instantaneously after being lit. No creature lives in Pandemonium by choice; it is entirely populated with creatures who were banished here or stumbled in by accident. In addition, creatures who stay for an extended period of time will almost certainly be driven to madness.