The Great Assembly House, also known as the Great Assembly, was an imposing domed building that housed the Planetary Council of the Outer Rim Territories planet Serenno located in the city of Carannia. The building contained the . The assembly hall contained the seals of the seven Great Houses of Serenno and a carving of the Tirra'Taka, an ancient reptilian dragon.
Up to 90 BBY, the Assembly Hall stood for generations and had survived invasion, storms, and revolutions. In 90 BBY, Jedi Initiate Dooku and Jenza, Dooku's sister, visited the main hall where a carving of the Tirra'Taka drew Dooku's attention. After Dooku touched the carving, a sudden earthquake occurred that caused the hall to collapse. The two children were later rescued by several Jedi Masters and rescue droids.
The Great Assembly House was a location that appeared in the canon audiobook Dooku: Jedi Lost, written by Cavan Scott and released on April 30, 2019.