The Yumix Estate is a large chain of Japanese-speaking, aviation-centric regions, linked together into a privately-owned micro-continent. The landmass incorporated a total of twenty-three regions at its height in 2013 and has since been reduced to sixteen sims as of September 2015. Its topography is generally flat with rare hills, separated by water into large and small islands. Isolated mountains can be found in some places, but altitude is low. The Yumix Estate has changed considerably over its years of operation as new regions are incorporated and others lost.