The address was later Jiaozhou, north-central Vietnam, China, Guangdong and Guangxi;
quicksand: It is recorded in Collection and Justice: Zhangye County, Ganzhou, which should be the area around Ganzhou District of Zhangye City today;
the flat wood is rather mysterious: a summary of overseas classics says, "There are mountains in the East China Sea, which are called Dushuo. There is a big peach tree in the world, which bends three thousand miles. So maybe it's Japan, maybe it's the Korean peninsula, maybe it's an outlying island in the East China Sea.