“What is this place?”

Ye Qingyu jumped out of the water, stunned at the sight before him.

This should be a node of the underground rivers, but whether it was natural or man-made, or caused by the erosion of the river, there was 1 kilometer of underground space in one area.

This space had not been flooded by the roaring underground river water, and was full of a mysterious and tranquil air.

And the location that he was currently standing on was a perfectly round ...