index.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Kota yang pernah ditempati</title>
</head>

<body>
  <style>
    html,
    body {
      height: 100%;
      margin: 0;
      padding: 0;
    }

    #map {
      height: 100%;
    }
  </style>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

  <div id="map"></div>

  <script>
    var locations = [
      [0.5070962889311029, 101.44709555841501, "Pekanbaru"],
      [1.6667175951416324, 101.40030032277191, "Dumai"],
      [-8.111217587366996, 115.09992744940679, "Singaraja"],
      [1.1241314190293445, 104.05581666288916, "Batam"],
      [-6.207202049757679, 106.84667310175972, "Jakarta"],
      [-7.847378764126453, 112.64585649996512, "Malang"],
      [-7.196598079052247, 112.75571965517271, "Surabaya"],
      [-8.722539402245673, 115.17820500320887, "Kuta"],
      [-6.2350577789082395, 106.97149289018748, "Bekasi"],
      [-7.4487551223961495, 112.70501621507442, "Sidoarjo"],
      [-8.781412553656022, 115.18346321801432, "Kuta Selatan"],
      [-8.665354459097442, 115.20955574629599, "Denpasar"],
      [-6.287298017772411, 106.71557921018847, "Tangerang Selatan"],
      [-8.56419857978349, 115.21985542851246, "Abiansemal"],
      [-8.53449164452091, 115.12732995334082, "Tabanan"],
    ];

    function initMap() {
      area = { lat: -2.1730294, lng: 113.9046833 };
      map = new google.maps.Map(document.getElementById('map'), {
        center: area,
        zoom: 5
      });

      for (i = 0; i < locations.length; i++) {
        marker = new google.maps.Marker({
          position: new google.maps.LatLng(locations[i][0], locations[i][1]),
          title: locations[i][2],
          icon: 'http://maps.google.com/mapfiles/ms/icons/red-dot.png',
          map: map,
        });
      }
    }
  </script>
  <script async defer
    src="https://maps.googleapis.com/maps/api/js?language=en&key=[PUT YOUR API KEY HERE]&callback=initMap"></script>
</body>

</html>