Restrict map panning to an area
Prevent a map from being panned to a different place by setting maxBounds.
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title></title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.36.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.36.0/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>

<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';

// Set bounds to New York, New York
var bounds = [
    [-74.04728500751165, 40.68392799015035], // Southwest coordinates
    [-73.91058699000139, 40.87764500765852]  // Northeast coordinates
];

var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v9',
    center: [-73.9978, 40.7209],
    zoom: 13,
    maxBounds: bounds // Sets bounds as max
});
</script>

</body>
</html>
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