There are 14 thousand hectares of rice terraces in Okayama Prefecture. Furthermore, they share 21% of the prefecture’s lowland field. Okayama has the second greatest area of rice terraces after Niigata Prefecture. ‘Tanada’ is the Japanese word for a rice field that is made in terraces on sloping land. In Okayama Prefecture, there are four areas that include some of Japan’s 100tanada. In the Oohaga-nishi district, the fields are spread around  the valley walls in a  bowl shape . Koyama district is also located withmountains ranged around it. There is a reservoir at the highest point of Kitasho District. The SetoInland Sea can be viewed from the Kamimomi District. Clan life in Western Japan during the Edo Period was compact. Moreover to make profit, rice paddies werebuilt upin the mountains. To increase theirprofit, the clans expanded the rice-growing areas by building terraces that were supported by stone walling. Because of their beauty, the fields nowadays are treated as sightseeing spots.