Lake Umberbool was a lake on Naboo, and the site of an arena for the Gungan annual Festival of Warriors. Shortly before the Battle of Naboo in 32 BBY a new arena was built at the bottom of the lake.
Lake Umberbool first appeared in Ryder Windham's 2000 children's book, Episode I Adventures 9: Rescue in the Core. It shared a name with Umberbool City, a location mentioned in the 2001 video game Star Wars: Galactic Battlegrounds.
- The Complete Star Wars Encyclopedia