Kala'uun is a large subterranean city on Ryloth, within the Lonely Five mountain range. Like all cities on Ryloth, it is located along the twilight terminator separating day from night. It has a large spaceport that is the center of interplanetary commerce for the Twi'leks. To protect it from heat storms and the native lylek, a massive portcullis blocks the only accessible underground tunnel to the city. The upper layers of the city host shops, tourist attractions, schools, and business opportunities that draw visitors from around the galaxy. Two large businesses centered in Kala'uun are Galactic Exotics and SchaumAssociates. The lower levels are rarely seen by visitors. These levels mainly feature residential areas and shops catering to residents. The largest and most opulent houses are located closest to the surface, spanning for a little more than a kilometer. Below them are more modest housing and excellent restaurants serving authentic Twi'lek food. At the very bottom and side caverns are where slums are located. Here the poorest Twi'leks tend to Rycrit cattle and raise algae for a living. Visitors are not allowed to enter the lower levels unless they have a special pass or are accompanied by a resident.