Megale Patris is the biggest continent of Polysiton, comprising roughly 55% of the surface that is not covered by water. Megale Patris is shaped like a ring: The Zoometer sea at its center which constitutes most of Polysiton's surface fresh water (although the Biophora aquifers rival Zoometer) and a source of most of its rivers. Megale Patris looked at a lateral perspective looks like a mesa: the outer regions of Megale Patris is generally gently sloped, while it grows relatively steep as it approaches the Zoometer.
To its northernmost edge is the region of Heliolechos Boreios, with Heliopolis serving as its representative polis. To the southwest of Heliolechos Boreios is Archaia, with Argis as the representative polis of the region. South of Archaia are Arrybia and Braxis Peninsula, Braxis a particularly important region given that it is the region in which the great city of Seleon (not surprisingly its representative polis) is located. Beneath the Braxis Peninsula (and southwest of Arrybia) is the region of Philolimen, with the city of Naupaktos serving as its polis. Bordering both Arrybia and Philolimen to the south is Ligouria, a region which by itself is not important, but as a buffer to Eschate, the most rugged region of Megale Patris and Polysiton as a whole. Eschate not only has two mountain ranges, the Chalepos and the Pauson, but it also has the lake Hetairion that serves as the protective buffer for Eschate's representative polis Hydrophile, while also feeding two rivers, the Timonion and Arga.
To the southwest of Ligouria and south of Philolimen is Samilos, which also has a representative polis by its name at the mouth of the Timonion River. Arga River is an important river, as it goes south to the region of Polyphora, which hosts Phovellis, its representative polis.