code: def _check_area_bbox(self):
          
          for coord in self.area_bbox:
              if abs(coord) > self.POP_WEB_MAX:
                  raise ValueError('OsmTileSplitter only works for areas which have latitude in interval '
                                   '(-85.0511, 85.0511)')
docs: The method checks if the area bounding box is completely inside the OSM grid. That means that its latitudes
          must be contained in the interval (-85.0511, 85.0511)
  
          :raises: ValueError