def _convert_bounding_box_to_geo_json(bbox):
  """Converts a lng/lat bounding box to a GeoJSON string."""
  lng_min = bbox[0]
  lat_min = bbox[1]
  lng_max = bbox[2]
  lat_max = bbox[3]
  return ('{{"type":"Polygon","coordinates":'
          '[[[{0},{1}],[{2},{1}],[{2},{3}],[{0},{3}],[{0},{1}]]]}}'.format(
              lng_min, lat_min, lng_max, lat_max))