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i think Shan Hai Jing(山海经) also mentioned Fusang
It mentions a tree called Fusang, not a country called Fusang. As I once wrote in 2006:
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The name 'Fusang' 扶桑 first appears in the Shanhai Jing 《山海经》, a compilation of mythological accounts of strange lands and creatures edited by Liu Xin 刘歆 of the late Western Han and Xin dynasties. It is stated there that in the 'Black-tooth Country' (Heichi Guo 黑齿国), in the Eastern Sea, the people are black-skinned and eat rice and snakes. They always have one red snake and one green snake at their side. Another version of the tale is that the people there keep tame pet snakes, one of which is always red. In the north of this country there is a valley called Hot Spring Valley (Tang Gu 汤谷), where a tree called the Fusang grows. The ten suns (this is from the legend of Hou Yi who shot down nine of the suns) bathe there. The Fusang tree grows in the water of Hot Spring Valley, and is very tall. When the ten suns are bathing, nine of them sit on branches that are underwater (i.e. in the hot spring water), and one of them sits on a branch above water.