C1608 Everyone Was Dumbfounded

The grassland was on the opposite side of the 100,000 mile ice river, and if one wanted to come out of the Folding Space, they had to go through the 100,000 mile ice river.

Therefore, whether it was the people from Earth or the people from the grassland tribes in the Folding Space, they couldn't avoid going through the frozen river.

How that river was formed, and why it turned into ice