Milvayne was a terrestrial planet located in an intersecting portion of the Inner Rim Territories and the Interior regions at the coordinates L-8 on the Standard Galactic Grid. Appearing green from above, much of Milvayne was covered in the expansive and crowded Milvayne City.

The upper levels of the city were riddled with towers and passages, and holographic viewscreens showing propaganda were displayed in midair. Residents there visited cantinas, more wealthy individuals going to high-up cuisine places. Below was the Milvayne’s undercity, or underworld, which comprised of junk piles, slums, and shantytowns. Imperial bloatbarges pumped foul out of the upper levels and into the underworld, causing the area to become very polluted and foggy such that heatspex and breath masks were used by some.