Incalia is the name Frederick S.
I keep a running list of the places it names, and these are the pages where Incalia appears.
On The Aleutian Islands - Ancient groups entering the continent from Asia via the northern route I quote the passage that connects Incalia to the mounds:
But the barbarians who went into Incalia, occupying the North American plains and lake regions—a future age should come which would find these hordes gone from the earth forever; and, later still, curious people digging from archaeological remains would say: “Here lived the mound builders.”
On Contain Thyself (7-1) Incalia is identified as North America, and some of the people went over the ocean to Umaur or to Incalia, South or North America respectively.
On A Grave Prophecy (8-1) Umaur and Incalia are colonies that follow the same religious practices as Poseid.
On Le Grand Voyage the travellers pass the Isthmus of Panama, then Mexico, called South Incalia, and the plains of the Mississippi.
On The vailx, powered by currents derived from the Night-Side of Nature Southwest Incalia corresponds to parts of the American Southwest, around the Rio Gila and the Colorado.
On The Waters of Light Incalia is a colony in the region of modern America.
For every page I tagged with Incalia, see the Incalia tag archive.
Successively we came to the Isthmus of Panama, then over four hundred miles in breadth; to Mexico (South Incalia) and to the immense plains of the Mississippi.
But the barbarians who went into Incalia, occupying the North American plains and lake regions—a future age should come which would find these hordes gone from the earth forever; and, later still, curious people digging from archaeological remains would say: “Here lived the mound builders.”
Based on the context provided in the passage, "Incalia" appears to refer to a region in North America, specifically the plains and lake regions occupied by early migrating peoples from Asia.
Here are some key points to help place "Incalia":
Interpretation of "Incalia": While "Incalia" is not a standard historical or geographical term, it seems to be a constructed or archaic name used by the author to describe this region.
In summary, ancient "Incalia" can be placed in the central and eastern regions of North America, encompassing the plains and lake areas where the mound-building cultures once thrived.
Mexico (South Incalia): A part of Atlantis' colonies, corresponding to present-day Mexico.
Incalia – A colony located in the region corresponding to modern-day America.
Sonora – A region in Southern Incalia, corresponding to modern-day Sonora in Mexico.
Umaur and Incalia (Colonies that follow the same religious practices as Poseid).
It was even so in the populous colonies of Umaur and Incalia, the difference in time being calculated, and one man in the great temple of Incal in Caiphul attended to this sweetly solemn duty.
Incalia - A place across the ocean, identified as North America.
But some went over the ocean to Umaur, or to Incalia, that is, South or North America, respectively; others went only to the more distant provinces in Atl itself.
Southwest Incalia: A region affected by geological changes, today corresponding to parts of the American Southwest, including areas like the Rio Gila and Colorado.
But the barbarians who went into Incalia, occupying the North American plains and lake regions—a future age should come which would find these hordes gone from the earth forever; and, later still, curious people digging from archaeological remains would say: “Here lived the mound builders.”