Aberdale is a fictional setting in Clarence. It is where Clarence, Jeff, Sumo and the rest of the characters live.
Aberdale is a large semi-suburban city that is known for its run down buildings, very messy streets and major tourist draw, Squirty's Moist Mountain Water Park, however, it is located outside of the area nearby the desert.
According to press releases, as well as the start of Average Jeff, Aberdale is in the American state of Arizona.
Aberdale is a fictional version of Prescott, a real city in Arizona because according to the pilot episode Aberdale Elementary was called Prescott School meaning that the show was suppose to be set in the actual Prescott.
Prescott is located between a forest/mountain range and desert, along with Aberdale.
Aberdale in Over the Garden Wall.
A town similar to Aberdale can be seen in the 2014 Cartoon Network miniseries Over the Garden Wall, as the buildings appear in a similar position. However, this coincedence could be a result of resused assests between the two, such as when characters' eyes blink.