A "loosely knit and militant empire" (issue 4, p.2).
The Sofim River is generally considered to be its eastern border, though the lands immediately beyond it (the Red Marshes) are not strongly held (or desired) by any one group. Its capital city is Serrea, located on the Sofim River.
Seprans (and New Seprans) speak in a "mock-Italian" accent.
Suenteus Po the illusionist describes it's Golden age as "...quite nearly Vanaheim on Earth. The greatest freedom for the greatest number, government control so decentralized as to be almost non-existent." (issue 158, p.7).