Jen was wandering like a leaf on water.
She was trying to remember and follow the map but this place was not mentioned in the map then rendering her helpless to find a path.
She admitted that she has lost her path and aimlessly thought to find a place for Cultivation.
If she cannot find a way now, perhaps after she breakthrough Legend Realm, she could find the path.
She heard the raging flow of the water near and start to look for it.
She saw the shiny lake of the water and unintentionally walked toward it, the expert was waiting for this moment, he used a whip and bright slash fell on her body, Jen lost her balance and fell in the lake triggering the core barrier.
The lake itself was hidden but the expert let it be exposed for few moments to trap the girl.
As soon as lake exposed, the barrier also appeared.
Swan Lake was under the barrier and runs around the core, only the expert who control this core can give anyone access to this hidden region.