今天学到的知识
湖南和湖北是以洞庭湖为分界 山西和山东是以太行山为分界 河南和河北是以漳河为分界，是西门豹治邺故事中那条河，不是黄河，因为黄河穿河南而过 鄱阳湖在江西境内，在南昌东部 嘉峪关在甘肃 山海关在秦皇岛 居庸关在北京
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