The Elemental Clans are enigmatic civilizations mentioned only briefly in the Golden Sun series. Each clan appears to be aligned with one of the four governing elements in Weyard, earth, fire, water, and wind. Some of these play an important role from a storyline perspective, such as the Jupiter and Mars clans. Others, such as the Venus clan, are not mentioned at all.
Note that not all adepts are members of the clan of their element. In the games, only those adepts who are in close proximity to the lighthouse of their element and have the blood of the clan in their veins are considered actual clan members. Examples of this would be the Mercury Clan members Alex and Mia. The people of Prox consider themselves descendants of the Mars Clan, and the disappeared civilization of the Anemos is effectively the Jupiter Clan.