You can add a magnifying glass feature which when you hover over that area 
it will magnify it. 
Just add this in your options 

magnifyingGlass : {enable: true, zoomFactor: 7.5}




On Tuesday, October 21, 2014 at 11:17:33 AM UTC-4, Henrique Vilela wrote:
>
> Got it.
> Thank you so much for your time.
>
> Anyone with an alternative simpler than recreate the pins with color and 
> size based on the value and legend over Google Maps, please let me know. :)
>
> Em 21/10/2014, à(s) 13:14, 'Sergey Grabkovsky' via Google Visualization 
> API <[email protected] <javascript:>> escreveu:
>
> Ah, well in that case, I don't think we have a solution for you. The right 
> thing would be for us to provide a province-level map for BR-RS, and then 
> that province would effectively be the only region on the map, but as I 
> said, this region is not available, and there's no way to change the 
> bounding box of the currently displayed region.
>
> On Tue Oct 21 2014 at 10:56:47 AM Henrique Vilela <[email protected] 
> <javascript:>> wrote:
>
>> I don’t think so.
>> It will add complexity to a simple task, and I will lose automatic 
>> features like the color values and the color legend that I’ll have to 
>> implement.
>> GeoChart is perfect to solve my problem, except by this little missing 
>> feature.
>>
>> Em 21/10/2014, à(s) 12:40, 'Sergey Grabkovsky' via Google Visualization 
>> API <[email protected] <javascript:>> escreveu:
>>
>> Actually, come to think of it, the Map visualization 
>> <https://developers.google.com/chart/interactive/docs/gallery/map> is 
>> much better suited for these kinds of charts.
>>
>> On Tue Oct 21 2014 at 10:37:45 AM Henrique Vilela <[email protected] 
>> <javascript:>> wrote:
>>
>>> Thank you for your fast answer.
>>>
>>> I just wan’t to be sure that my needs are clear.
>>> I don’t need a different map, all that I need is to “zoom in” to avoid 
>>> the empty space around the data, without adding any kind of "level of 
>>> detail".
>>>
>>> Even this is not possible with Google GeoChart?
>>>
>>> Would you recommend any alternative? Google Maps, maybe?
>>>
>>>
>>> Em 21/10/2014, à(s) 12:23, 'Sergey Grabkovsky' via Google Visualization 
>>> API <[email protected] <javascript:>> escreveu:
>>>
>>> Hi, there's no way to recrop the map to be exactly what you want. For 
>>> some countries, we generate province-level maps, but it appears that Brazil 
>>> is not one of those countries. Please file a bug against this, this as it 
>>> would be good to have these maps.
>>>
>>> On Tue Oct 21 2014 at 10:14:01 AM Henrique Vilela <[email protected] 
>>> <javascript:>> wrote:
>>>
>>>> Hi,
>>>>
>>>> I'm trying to display data about cities in a specific Brazilian 
>>>> province. To to this I'm using { region: 'BR', resolution: 'provinces', 
>>>> displayMode: 'markers' }
>>>> The problem is that all the points are concentrated in a small area of 
>>>> the map (attached image).
>>>>
>>>> There's a way to select a specific province or to "crop" de map to 
>>>> focus on the real data?
>>>>
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