During Lạc Long Quân's time, the people of Van Lang was still undeveloped and isolated. In the Eastern sea, there appears a giant Fish called Ngư Tinh (, Vietnamese for "fish monster" or "fish spirit"). This fish has lived for many centuries and had a mouth so big it could swallow an entire ship containing 10 fisherman in a single gulp. Whenever the fish swim, waves would reach for the sky, drowning many ships unfortunate enough to be caught in its path, and all the people passing through the area would become the fish's next meal. Ngư Tinh lives in a big cave under the sea, above the cave is a huge mountain which divides the sea into two areas.