The palace maid Yun Zhefang, who carries the "Yuanhe County Map", is married to Wuluolan Grassland. The red makeup is not what she wants, and the mountains and rivers are in her heart. When she first set foot in a foreign land, she discovered the myth of "river source" with her keen eyes, redrawn the map with "planning and drawing squares", measured snow peaks with boiling water, and revised the "frontier geographical map". Faced with the pasture dispute, she skillfully analyzed the geography and used pictures as a matchmaker to promote "border survey." There is no golden finger to counterattack, only the insights between warp and latitude. From the deep palace to the wilderness, a precise map was a powerful tool for her to mediate the royal court and establish "mutual trade". She composed a legendary epic that used geographical wisdom to measure the world and reconcile neighbors.
