With the arrival of the warm season, the vast waters of Thunder Marsh had completely evaporated, revealing flat ground.
It was now May.
All kinds of weeds and saplings had begun to emerge beneath the sunlight.
Yet beneath Thunder Marsh's seemingly vibrant surface lay dangers everywhere. Small puddles dotted the weeds, while the dry ground beside them was actually muddy swampland lying in wait for people and livestock to sink into.
"Roar!"
Black Oil Dragon Rosai flew slowly close to the ground, letting out an occasional meaningless roar. He liked this warm weather.
On the dragon's back, the Lord of Thunder Mark flickered on Russell's forehead, while snow-white wings manifested behind him.
He was observing Thunder Marsh at close range. By the time Rosai had circled the marsh once, Russell had a clear understanding of it.
"Thunder Marsh's outline is rather irregular, but it is roughly a circular territory. The ground is flat as far as the eye can see, with scarcely even a small rise in the land." Russell casually sketched a map on a sheet of draft paper.
"The lowest point is a depression slightly southwest of the territory's center. This would be suitable for digging a lake."
On the map of Thunder Marsh he had just drawn, Russell marked an "×" to represent the planned lake.
Then, with broad strokes, he drew two straight lines crossing the "×" on the map. "Hmm, not only do we need to dig a lake, we also need to excavate two river channels to guide all the territory's water into the lake and reshape the swamp terrain."
After digging the lake and river channels, they would need to further excavate drainage ditches, striving to completely drain the standing water from the vast swamplands.
As for the low-lying regions where water could