Setting up Google Geomap visualization for Italy regions

I'm trying to set up a geomap visualization for Italy's regions, but if I use regions, ins开发者_运维技巧tead of markers for my dataMode option it doesn't work. I'm obviously just beginning to learn how to use this API, thank you in advance.

function drawVisualization() {
      var data = new google.visualization.DataTable();
      data.addRows(2);
      data.addColumn('string', 'Region');
      data.addColumn('number', 'Popularity');
      data.setValue(0, 0, 'Tuscany');
      data.setValue(0, 1, 200);
      data.setValue(1, 0, 'Verona');
      data.setValue(1, 1, 300);

      var options = {};
      options['region'] = 'IT';
      options['colors'] = [0xFF0000, 0xc06000];
      options['dataMode'] = 'markers';

      var geomap = new google.visualization.GeoMap(
          document.getElementById('visualization'));
      geomap.draw(data, options);
    }

function drawMap() {
    var data = new google.visualization.DataTable();
    data.addRows(6);
    data.addColumn('string', 'Country');
    data.addColumn('number', 'Popularity');
    data.setValue(0, 0, 'Lombardia');
    data.setValue(0, 1, 200);
    data.setValue(1, 0, 'Campania');
    data.setValue(1, 1, 300);
    data.setValue(2, 0, 'Lazio');
    data.setValue(2, 1, 400);
    data.setValue(3, 0, 'Toscana');
    data.setValue(3, 1, 500);
    data.setValue(4, 0, 'Sicilia');
    data.setValue(4, 1, 600);
    data.setValue(5, 0, 'Veneto');
    data.setValue(5, 1, 700);

    var options = {};
    options['dataMode'] = 'regions';
    options['region'] = 'IT';
    var container = document.getElementById('map_canvas');
    var geomap = new google.visualization.GeoMap(container);
    geomap.draw(data, options);
};