The ARK: Survival Evolved site has been updated with a notice that the next PC update will be delayed until May 3rd. The reason for delay is the "active remodeling" of a volcano will result in several meters in its vicinity being buried under an ocean of lava. The advanced notice is to give players a chance to move out of the "green zone" prior to the patch's deployment.
In the next PC update, the volcano will be receiving an active remodelling which will consume anything in the vicinity. A client-side patch pushed out earlier today now includes these borders in your game so you can see the affected area. You are HIGHLY recommended to move out of the area before the v257 patch goes live.
You can visit the ARK: Survival Evolved forum to check out more and to listen to some new tunes that will be coming to the game.