Hi! I'm a newbie, I started playing around with GoogleCharts last week, 
because I would like to use GeoCharts for my project website. I started off 
copying and pasting the examples given at: 

https://developers.google.com/chart/interactive/docs/gallery/geochart 

but only the first one works, the one for "regions". As for the other 
examples, they do show the geographic boundaries, but ignore the data. 

Reading around the documentation, I found that the syntax for loading the 
libraries has changed, but also using the new syntax the data is not shown. 
I also changed the API key given in the example with my own, just generated 
for this project. I have searched for similar issues in this group but have 
not found anything to my case. What have I missed? Can somebody help me 
understand what's wrong with these examples? 

I paste below the example 

https://developers.google.com/chart/interactive/docs/gallery/geochart#marker-geocharts

https://developers.google.com/chart/interactive/docs/gallery/geochart#marker-geocharts

given at: 
https://developers.google.com/chart/interactive/docs/gallery/geochart#marker-geocharts
modified with new syntax, but with the same key API given in the example. 

Many thanks!
Caterina


<html>
  <head>
    <script src='https://www.gstatic.com/charts/loader.js'></script>
     <script src="https://www.google.com/jsapi";></script>
    <script>
     google.charts.load('current', {
       'packages': ['geochart'],
       // Note: you will need to get a mapsApiKey for your project.
       // See: 
https://developers.google.com/chart/interactive/docs/basic_load_libs#load-settings
       'mapsApiKey': 'AIzaSyD-9tSrke72PouQMnMX-a7eZSW0jkFMBWY'
     });
     google.charts.setOnLoadCallback(drawMarkersMap);

      function drawMarkersMap() {
      var data = google.visualization.arrayToDataTable([
        ['City',   'Population', 'Area'],
        ['Rome',      2761477,    1285.31],
        ['Milan',     1324110,    181.76],
        ['Naples',    959574,     117.27],
        ['Turin',     907563,     130.17],
        ['Palermo',   655875,     158.9],
        ['Genoa',     607906,     243.60],
        ['Bologna',   380181,     140.7],
        ['Florence',  371282,     102.41],
        ['Fiumicino', 67370,      213.44],
        ['Anzio',     52192,      43.43],
        ['Ciampino',  38262,      11]
      ]);

      var options = {
        region: 'IT',
        displayMode: 'markers',
        colorAxis: {colors: ['green', 'blue']}
      };

      var chart = new 
google.visualization.GeoChart(document.getElementById('chart_div'));
      chart.draw(data, options);
    };
    </script>
  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>

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