Haya quickly ordered people to go outside the city to prepare a retreat, and then returned to Ruan Yanluo's side, and brought a map with him.

Among so many countries on the mainland, the map of Xiliang is the most difficult to draw, and it is also the most mysterious, because almost the entire country of Xiliang is hilly, with different altitudes, and because it is rich in mineral deposits, different mineral deposits often lead to the special nature of the local geographical environment, sometimes, even if you have a map in hand, it is useless, not a real local, never know what kind of situation you will face.

The map that Haya brought was clearly different, not only did it have detailed numbers indicating the height of each hill, but the whole map was so colorful that it almost matched a drawing board.

"This is ......," Ruan Yanluo asked with some confusion.

"The white is silver, the black is iron, the gray is lead, the vermilion is cinnabar, the red is hematite, and the yellow is copper...... "Haya came one by one, such as a number of treasures.

Ruan Yanluo followed her finger and looked over, only to see that there were nearly ten kinds of mineral deposits scattered around the capital; , the area of each is not very large, but like the stars holding the moon, it encloses the Xiliang capital in the middle.

This is inconsistent with what Ruan Yanluo knew in his previous life, the formation of each kind of mineral deposit has its own unique geographical environment, it stands to reason that it is impossible to form so many such rich and dense mineral deposits near the same geographical environment, but now it has been formed, and she has seen it with her own eyes.

Now is a critical moment of life and death, Ruan Yanluo does not think that Haya will joke about this kind of thing at such a time, that can only show that her experience in her previous life is not 100% universal in this life, for example, this phenomenon of mineral deposits being concentrated in one place is not something that can be explained by the knowledge she knew before.

Fortunately, Ruan Yanluo's receptivity has always been a little stronger than others, although he was a little surprised, but he didn't feel that it must be impossible.

She looked at the map carefully, as if she remembered something, and asked, "You Xiliang love to wear colorful clothes, is this the reason?" ”

The colorful clothes are the traditional costumes of Xiliang, and even the uniforms of the soldiers are more colorful than those of other countries, although Ruan Yanluo accepted this kind of folk customs before, she didn't think about why, and when she saw the map in Haya's hand, she felt as if she had found the reason.

Speaking of this, Haya was a little proud, and said: "Of course, because of this, my ancestors in Xiliang discovered this treasure land, and because of this, they were based on the founding of the country, these mineral deposits can be described as the treasure and pride of my Xiliang, and of course I should commemorate it in Xiliang." ”

Ruan Yanluo raised his eyebrows and did not comment, but he was sure that the person who established Xiliang must have been a woman, otherwise, he would not have thought of this way of commemoration.

You know, only women use clothes to commemorate things.

Although talking to Haya, Ruan Yanluo's eyes were still on the map, she carefully studied the map, not letting go of every detail on the map, and suddenly, she pointed to a small black area on the map and asked, "What is here?" ”

The black area was really only a small dot, and compared to the place where there was at least one fingernail-sized place in other places, that small spot was almost negligible, but it was such a place that could be ignored, but it seemed to have been highlighted, and a skeleton shape was drawn with a black pen next to it.

If it is on other maps, black is the most inconspicuous eye, and there is nothing to pay attention to at all, but the whole map of Haya is colorful, and suddenly a black stroke, or the shape of a skeleton, makes people can't help but pay attention.

Haya frowned at the sight of the place and said, "It's a place of death. ”

"Deadland? How? Ruan Yanluo was interested.

If we talk about the place of death, they are the real place of death now, and there will be no worse situation than they are now, and as the saying goes, if you put the place of death and then live, maybe there will be a life that they can't think of.

Seeing that Ruan Yanluo was so interested, Haya knew that Ruan Yanluo was playing there, so he stiffened his face and said, "Ruan Yanluo, don't think about it, it's not so fun there." ”

"Why is it not easy to play?" Ruan Yanluo insisted on knowing that no matter what it was, before making a conclusion, it must be understood first.

She stared at Haya with bright eyes, Haya was furious by Ruan Yanluo, and finally defeated under Ruan Yanluo's eyes, and said: "I don't know what it is, it looks like low coal, but after it is mined, as long as it is burned, someone will inevitably be poisoned and die, not only that, but in the summer, there are more or less flowers and grass growing in other places, only that place, not an inch of grass grows, and people or animals who walk nearby, they will suddenly die, the doctor said that it was poisoned, but no one knows what poison it is." ”

Haya frowned a little unhappily and said, "After a long time, everyone knows that it is a dead land, and no one goes there, and the map is only marked like this, in case the march or something goes to the wrong place." ”

Ruan Yanluo listened as he thought quickly in his head.

It's like coal, but it can't be burned, and when it's hot, people die.

This shows that the coal contains something that, when heated, will release toxic gases.

But what is it that makes it so toxic? It can also make people die instantly.

Something suddenly jumped into Ruan Yanluo's mind: sulfur!

Now in ancient times, coal is naturally generated, containing all kinds of impurities, and it is impossible to use technology to remove all the harmful components in coal like the world she came to before, so it is normal for coal to contain a little sulfur.

This sulfur-containing coal may form sulfur dioxide and sulfur hydrogen under the action of heat, both of which are toxic to the human body, especially hydrogen sulfide, which is highly toxic, not only inhaled, but even skin contact or conjunctival contact, which may poison people.

Generally speaking, the concentration of this naturally occurring hydrogen sulfide is generally less than one percent, which will not cause much harm to the human body, but since the hydrogen sulfide here can already kill people, it means that for some reason, the sulfur content in the coal here is very high, and the environment there must be relatively closed, so it can form such a high concentration of harmful gases.

Ruan Yanluo's eyes were fixed on the map, sure enough, the more dead the place, the more alive, that place was almost a natural killing ground, if he could lead Wei Liu's army there and stop them, maybe not only could he temporarily stop Wei Liu, but he could even buy enough time for Nangong Jin to let him retreat with the army and the people of the capital.