SnowDin Forest

SnowDin Forest is the 4th place you go in. The first part is just some really tall trees but a sign is in the middle of some the sign says:

WARNING

If you Go IN FoRwarD YoU Might NoT ComE OuT

-Toriel

when you read that if your an Undertale fan you now know somehow Toriel survived Frisk when Frisk killed Toriel to leave the RUINS Toriel did not die.