Origin and Structure
Ephinea was originally a barren, lifeless moon orbiting the planet Fodra. At an unknown time a little over 1,000 years before the story, Fodrans decided to colonize their moon. It's said in some places throughout the game that part of the reason was so that they could escape Fodra's imminent destruction.
Ephinea was built by transplanting part of Fodra's Lastalia into a man-made Lastalia within Ephinea's core. A rotating ring called Foselos was created to orbit Ephinea and largely functions as a means to keep eleth on the moon's surface from escaping into space. Presumably, it also maintains the Aquasphere--the "ocean" in the sky.
Eleth on Ephinea is produced by the Lastalia, however due to being man-made the eleth produced by it would remain stagnant. For this reason, there are Valkines Cryas on the surface of Ephinea--three for each type of Eleth. These Valkines each produce and maintain the flow of their individual type of eleth so that eleth is distributed as evenly as possible throughout Ephinea.
Duplemar maintains water eleth throughout Ephinea and is the cause of Strahta becoming a desert.
Forbrannir maintains fire eleth and is the cause of Fendel becoming a cold, snowy region with harsh conditions.
 Guardians of Ephinea
 Special Places on Ephinea
Due to the nature of how eleth moves about on Ephinea, there are some places that have large amounts of accumulated eleth or where all 3 types of eleth converge and create various types of natural phenomena.
Lhant Hill is one such place where the natural phenomena is that flowers bloom there all year long.
 Countries of Ephinea
Ephinea has three countries, each with one of the three Valkines.