The Ryukyu Domain (琉球藩, Ryūkyū han) was a short-lived domain of the Empire of Japan, lasting from 1872 to 1879, before becoming the current Okinawa Prefecture and other islands at the Pacific edge of the East China Sea. When the domain was created in 1872, Japan's feudal han system had developed in unique ways. The domain was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields. In other words, the domain was defined in terms of kokudaka, not land area. This was different from the feudalism of the West.