The area that all of the contestants have spawned could be said as a general area. The safe zone is basically an area that is only five meters in diameter. They will also appear invisible to the monsters as long as they are inside of the safe zone.
There is also no monster that can be lured in the safe zone to ensure that the hit and run or bait and switch tactic will not be used. The contestants also tried experimenting with the safe zones by damaging a monster and escaping to the safe zone.
If they damage a monster and gets it attention, they can still escape to the safe zone but the damage they dealt will be immediately healed. The monster will also be cleansed of all debuffs that the players have inflicted. Players are also unable to cast spells like buffs inside of the safe zone.