Soumerca is a continent in the southern hemisphere of Mobius.
The continent of Soumerca is the ancient home of the Felidae and the Wolf Pack, as well as the site of Ixis Vale's tomb. Some time after the Forgotten War and 4000 years before the First Robotnik War, it was visited by a group of Echidnas from Albion seeking a new home. This group ended up fighting with the Felidae, and split into three factions: the Knuckles Clan, Nocturnus Clan, and a group of intellectuals who left to escape the conflict eventually traveling to Downunda and building Echidnaopolis. The Knuckles Clan were eventually wiped out by the vengeful Chaos, while the Nocturnus Clan disappeared as a result of the Argus Event. At some point, a mystical stone known as the Ancient Onyx became a sacred artifact to both the Felidae and Wolves, as well as being used to imprison Chaos by Tikal of the Knuckles Clan. The Wolves eventually departed their homeland for lands in Northamer, and the Felidae laid claim to the entire region. (CSE) </tabber>
- Mystic Ruins
- Great Rainforest
- Windy Valley
- Ixis Vale's Tomb
- Mount Mobius
- Holy Summit
- Knuckles Clan colony (destroyed)
- Mysterious Cat Country
- Station Square
- Wolf Pack Nation
- Soumerca is based on South America, with the name being a partial portmanteau.
- The name of this continent was introduced in an entry on the Sonic the Hedgehog comic blog detailing E-102 Gamma's mission to locate and "liberate" the remaining E-100 Series robots of the Eggman Empire. 
- Along with Efrika, Soumerca was one of several regions of Mobius revealed to have survived the events of Worlds Collide with its original name intact. Mercia, Downunda, and the Northern Tundra were renamed Avalon, Tralius, and Artika respectively.