[Grim_]

This is not tested, but it might work...

//top of script

pawn Код:

forward AreaCheck();

//somewhere below 'main()'

pawn Код:

public AreaCheck()
{
 for(new i = 0; i<MAX_PLAYERS; i++)
 {
   new Float:Pos[3];
   GetPlayerPos(i, Pos[0], Pos[1], Pos[2]);
   if(PlayerToPoint(1, i, thex, they, thez)) //replace "thex, they, thez" with the coordinates of the place 
   {
    GameTextForPlayer(i, "You are at the special spot", 5000, 5); //or whatever message you want displayed
   }
 }
 return 1;
}

//under OnGameModeInit

pawn Код:

SetTimer("AreaCheck", 1000, 1);