Regarding the monster density in the Umbrella Biological Test Field, if we were to distinguish proportions, about eighty percent of the monsters are found in the urban areas, while only a scant twenty percent are distributed in the suburban environment. This is why Zhang Yanhang always said that the monster density is not quite uniform, as it is indeed quite uneven.

Furthermore, when analyzing monster density based on the land area, it becomes even more imbalanced. Out of the 40,000 square kilometers of the Umbrella Biochemical Test Field, the urban area occupies only about 15,000 square kilometers, while the outskirts take up 25,000 square kilometers.

We can say that the suburbs not only have a large area but also a significantly low number of monsters, making it particularly 'spacious' in a sense.

However, this spaciousness is only relative. Compared to the mountain regions on the outskirts of the Umbrella Biochemical Test Field where not a single monster can be found, the suburbs have quite a favorable position, with one to two thousand monsters distributed proportionally.

The remaining seventy to eighty thousand monsters are naturally all distributed in the urban areas. This is exactly why Zhang Yanhang said that in some suburban areas, there might not be a single monster within ten square kilometers, whereas in some urban areas, there could be ten monsters per square kilometer, as this is precisely the case.

Therefore, when devising the cleaning plan for the Umbrella Biochemical Test Field, Zhang Yanhang naturally focuses on the urban area first. He plans to clear out the urban area first, and then move to the suburban parts.

Moreover, it's worth mentioning that, based on Zhang Yanhang's scans, he was surprised to find that although the suburbs have fewer monsters, the quality of the monsters there is much better than in the urban area.

The most obvious quality gap is that the Lord Monster of this Umbrella Biochemical Test Field does not stay in the downtown area, but rather in the suburbs, particularly the part of the suburbs near the mountains.

There's no denying this surprised Zhang Yanhang quite a bit, given that he's used to finding most Lord Monsters at the heart of a region. For those not in central areas, like the Crimson Iron Queen Ant and the Crimson Iron Ant Queen, they are usually at the far end of the Ant Nest, surrounded by layers of Crimson Iron Ants.

Yet, the Lord Monster of the Umbrella Biochemical Test Field finds itself in a rather peculiar, out-of-the-way place, neither in a village nor in a store.

Fortunately, it's not a major issue, as Zhang Yanhang wasn't planning on defeating the Lord Monster right from the start. Because of the lower monster density in the suburbs, Zhang Yanhang had already prepared to finish clearing out the suburbs, including the Lord Monster, in the final two stages.

Given the unprecedented size of the Umbrella Biochemical Test Field, Zhang Yanhang is planning to divide the entire cleanup plan into six stages.

As we talk about these six stages, we must first introduce the topography and terrain of the urban part of the Umbrella Biochemical Test Field.

According to Zhang Yanhang's scans, although the city is incredibly vast, covering 15,000 square kilometers, it isn't a complete city. It has noticeable composite sections, having absorbed other cities and developed the middle adjacent areas, which is why the whole city appears so huge, becoming a gigantic mega-city.

During his scans, Zhang Yanhang took the opportunity to observe the name of the main city at the center. The name is quite straightforward and to the point; it's called 'Umbrella City.'

Zhang Yanhang suspects that the reason this area is named the Umbrella Biochemical Test Field might be related to Umbrella Corporation, but more likely because of the existence of this city, making the entire Umbrella City a biochemical test field.

And by his estimation, Umbrella City has swallowed at least a dozen other cities, including small towns, villages, or urban villages, as well as counties. However, these small units generally don't cover a large area, with the smallest being only a few dozen square kilometers, and the largest only a few hundred square kilometers.

So, the only noteworthy cities are the two absorbed ones that were at the administrative level of a regional city.

These two cities had a similar area, one about 3,800 square kilometers and the other around 4,300 square kilometers. Well, it might not be super accurate since Zhang Yanhang estimated by sight, but both are certainly around 4,000 square kilometers.

After all, being a Fourth Tier Awakener with an Intelligence of a hundred points, his mental calculation ability is far superior to ordinary people. So, even though it's by sight, it's almost like directly measuring with a ruler, and it's unlikely to have significant errors.

Besides, since cities are irregularly shaped, calculating to this degree is already quite precise. There's no reason to estimate to decimal points, as the only purpose for calculating land area was to find a reference for better planning the cleanup.

Among the two, the smaller city is named Terra City, and the larger one is called Gelijia City. Zhang Yanhang is somewhat familiar with these city names.

He remembers a high-tech floating city on the sea from Resident Evil Revelations, commonly known as an artificial island.

This floating city's name is Terragrigia City, so Zhang Yanhang reckons that Umbrella Corporation might have named these two cities in some form of commemoration of Terragrigia City.

As for why there's a sudden need for commemoration, it's naturally because Terragrigia City, although it was a high-tech artificial island, filled with futuristic technology, still committed the old error of being human-centric. The biohazard virus leaked, causing a biochemical crisis, turning it into a zombie-filled dead city like Raccoon City.

For all Umbrella Corporation's various branch bases, ending in leaks of biohazard viruses, resulting in a biochemical crisis, then zombies sweeping through the city, Zhang Yanhang does feel like criticizing. But thinking of Resident Evil's main theme of fighting zombies, without a virus outbreak, there wouldn't be any zombies for players to combat, he understands.

Besides, a normal human city without a virus outbreak would usually have a power Rank quite low, probably only about First Tier, making it hardly qualified to be selected by the Ashen World, let alone appearing before him as a Fourth Tier Awakener for clearance.

After all, Umbrella Corporation primarily researched biotechnology and was not very skilled in other kinds of black tech weapons. At most, they might study energy weapons or the like, for he remembers Umbrella Corporation seemed to have electromagnetic guns, the kind that emits blue plasma, and additionally, there are laser weapons that emit red lasers.

In terms of planning the clean-up plan for the Umbrella Biochemical Test Field, Zhang Yanhang intends to set Terra City and Gelijia City as the phase goals.

In the first phase of the six phases, Zhang Yanhang plans to first clear the smaller Terra City, which, despite its smaller size, covers an area of 3,800 square kilometers and has a Lucky Slot Machine at the edge.

Once Zhang Yanhang has cleared it, he can try his luck at the Lucky Slot Machine to see what good things it might offer in this high-level area.

For the second phase, Zhang Yanhang plans to proceed with clearing Gelijia City, which covers an area of 4,300 square kilometers. Although larger in comparison to Terra City, it has a slightly lower building density.

Therefore, Zhang Yanhang prefers Gelijia City more since the lower building density allows for smoother movement, or in other words, fewer collisions with buildings during movement.

After all, it's one thing to crash into smaller multi-story buildings, but crashing into tall buildings with dozens or even hundreds of floors could significantly slow down progress, as such substantial buildings can easily create barriers over a hundred meters tall when they collapse.

Yet, Umbrella City and its subordinate cities are highly modernized, with skyscrapers ranging from a hundred to hundreds of meters high common everywhere. It will undoubtedly cause quite a bit of trouble during his monster clearing.

Even though he can fly, flying consumes time; it still takes extra time. So, for Zhang Yanhang, it's usually 'all are inferior, only the plains are high.'

After all, the plains place no restrictions on movement, which is truly enjoyable, but unfortunately, Zhang Yanhang has only encountered the Goblin Plain among the six cleared regions so far.

Even counting the Volcano Permanent Teleportation Channel and the Christmas Permanent Teleportation Channel, Zhang Yanhang has already entered eight regions, but only the Goblin Plain was a plain. In complex terrains and geographical features, plain terrains are indeed quite rare.

For instance, Raccoon City is a modern city, the Demonized Swamp is a forest swamp, both the small Crimson Iron Ant Nest Dala Gu and the large Crimson Iron Ant Nest Talano are underground nest structures in mining veins.

The Volcano Permanent Teleportation Channel is a vast area of super-volcanoes, and the Christmas Permanent Teleportation Channel resembles Iceland, with enormous ice fields, whereas the current Umbrella Biochemical Test Field consists of mountains and valleys.

It can be said that except for small Crimson Iron Ant Nest Dala Gu and large Crimson Iron Ant Nest Talano, which have a consistent environment, there are no repeated environments. This shows that when faced with various complex power systems, encountering similar terrains is not wishful thinking, but from a probabilistic standpoint, it's a daydream.

But daydreams aside, this doesn't change Zhang Yanhang's longing for plain areas, though they are indeed hard to come by.

In Gelijia City during the second phase, besides the slightly lower building density, commonly known as an underdeveloped economy, Zhang Yanhang also discovered an Evaluation Settlement Treasure Box in the neighboring town within the Umbrella Biochemical Test Field area.

So, once he clears Gelijia City and the neighboring town in the second phase, he can check out the Evaluation Settlement Treasure Box from the Umbrella Biochemical Test Field there.

For the third phase, since Umbrella City still spans 7,000 square kilometers even after removing Terra City and Gelijia City, which is quite large, Zhang Yanhang plans to divide it into two phases to complete.

During the third phase, he primarily focuses on clearing the areas surrounding Terra City and Gelijia City, targeting an area of about 3,000 to 4,000 square kilometers.

Then, for the fourth phase, it involves clearing the remaining areas of Umbrella City, particularly those closer to the center. By then, any remaining area from the third phase will be cleared until the urban part of Umbrella City is completely cleared, marking the completion of the fourth phase plan.

Usually, after clearing the central area in the fourth phase, Zhang Yanhang's fifth phase would definitely be to take down the Lord Monster directly.

But unfortunately, this time, the Lord Monster is located near the mountains, positioned at the outskirts' edge.

Therefore, Zhang Yanhang's fifth phase plan is to first clear the suburbs, completely clearing the 25,000 square kilometers of suburban area in one go before tackling the Lord Monster.

Although 25,000 square kilometers seems quite large, considering the low monster density, or rather, pitifully low density, Zhang Yanhang is confident in clearing it all in one round, as this area contains only 20% of all the monsters in the Umbrella Biochemical Test Field.

During previous distributions, Zhang Yanhang's first four phases involved eliminating about 20% of the monsters in each phase, so he believes it's reasonable to eliminate the final 20% of the monsters in the fifth phase.

Though the area is indeed large, it's fortunate that it's a suburban area with no buildings, quite similar to plains, allowing for unrestricted movement. Plus, with the low monster density, the clearing should be at least twice as fast as in urban areas.

Moreover, the Achievement Vending Machine is also located in the suburban area, or rather, in a small village within the area. It's indeed a very small village, covering only a few square kilometers with almost no monsters.

But Zhang Yanhang has always dealt with the Achievement Vending Machine only after clearing all the monsters in the entire area, so he doesn't really mind if the Achievement Vending Machine is in the suburb or the city.

As for the final sixth phase, naturally, it involves clearing the area surrounding the Lord Monster and subsequently taking down the Lord Monster, completing the thorough clean-up of the entire Umbrella Biochemical Test Field.

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