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Zhan Beihan couldn't get the topographic map of Nan Yan in Northern Qin. Even if it was available, it was just a poor map, which was very different from the actual terrain.

Basically useless.

On the contrary, Zhong Ronggui, a profiteer, traveled between Northern Qin and Southern Yan all the time and had a lot of knowledge about the topography of the two countries.

After he was forced to cooperate with Zhan Beihan, in order to perform meritorious service, he took the initiative to reveal that he had a map of Nanyan, which he secretly drew when his ancestors were doing business. It was passed down from generation to generation, and it mapped many locations of Nanyan cities and mountains and rivers.

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Hiding a map is a serious crime, and if caught you will be beheaded.

Therefore, the noble ancestor Zhongrong did not dare to tell anyone, but secretly kept it to himself to record his business journey.

It has been several generations since the map was passed to Zhong Ronggui. When he was conducting trade between the two countries, he also added some new towns and terrain to it, so its credibility is quite high.

When Zhan Beihan found out, his expression immediately turned gloomy.

He first asked Zhong Ronggui to hand over the topographic map, and the next second the sword was placed on his neck, asking him if he had secretly drawn the topographic map of Northern Qin.

Zhong Ronggui cried bitterly and knelt down on the spot, swearing to God that it was absolutely not the case.

Zhan Beihan didn't believe it at all and almost chopped him down. Zhong Ronggui was so frightened that he screamed for mercy and poured beans out of the bamboo tube.

Xiao Lingyue was watching from the side, but he didn't lie.

He indeed did not have a topographic map of Northern Qin.

The reason is a bit ridiculous.

Because the terrain of Northern Qin was not as complex as that of Southern Yan, with mountains and rivers covering most areas, most places were basins and plains. The distribution of cities was very regular, so it was not difficult to memorize routes.

Moreover, all the people in Northern Qin worshiped martial arts and the folk customs were very tough. Zhong Ronggui wanted to be careful when doing business and did not dare to hire Northern Qin people to explore the terrain. Naturally, he could not secretly draw maps.

Zhan Beihan's face softened slightly when he heard this, and then he spared his life.

Zhong Ronggui's precious map of Nanyan naturally fell into Zhan Beihan's hands.

"What did you take out the map for?"

Xiao Lingyue leaned over and took a look, and she couldn't help but raise her eyebrows when she saw that he had drawn a line on the map of the Weishui River, and then counted the towns along the edge one by one along the river.

Zhan Beihan said calmly: "You believe that Zhao Yongchang will not do tricks, but I don't believe that."

"So you just checked the map?"

Xiao Lingyue was a little helpless, "You are so suspicious, you really should forget about it."

She said nothing.

This map was secretly drawn by Zhong Ronggui's ancestors. The level of detail is far inferior to the topographic maps in the army, and it is even very rough.

There are messy lines everywhere on the map. The river is just a winding line, the towns are replaced by circles, and the high and low intersecting lines next to it are probably mountains.

Xiao Lingyue took a closer look and pointed: "With Yongjing as the axis, looking at this picture, the accuracy is quite high."

As she spoke, her fingertips shifted a few inches and pointed to a circle next to her.

"This is Huai City, and the circular arc next to it refers to the Huai River."

She continued to move down along the arc, and a crooked line extended out and merged with another, thicker, curving black line.

"The Huaishui River is the same as the Weishui River. It passes through more than 20 cities and can go all the way to Weishui City. We are on this river now, and the next intersection will be the Huaishui River."

"Where is this place?" Zhan Beihan suddenly pointed to the side of Huaicheng. There was a long line crossing each other, with no words written on it.

"It should be a mountain range, right?" Xiao Lingyue recalled uncertainly.
Chapter completed!