The upper sprawl constituted an extensive sector within the city of Mos Espa, which itself was located on the desert Outer Rim planet of Tatooine. After the death of Jabba Desilijic Tiure, his majordomo, named Bib Fortuna, rose to power, claiming the title of lord and seizing command of Jabba's criminal empire. In order to maintain authority, Fortuna split Mos Espa into three distinct family territories, with the Klatooinian family exercising dominion over the upper sprawl and the spaceport.
According to "World Building" documentation, it is believed that both Watto's junkshop and the Mos Espa Grand Arena were situated within the confines of the upper sprawl.