you are trying to use the new Styled Map features of thev3 Maps API. Here’s a very basic example of how you could use the above style in a simple map
<!DOCTYPE html><html><head><metahttp-equiv="content-type"content="text/html; charset=UTF-8"/><title>Google Maps Dark Water Style Demo</title><scriptsrc="http://maps.google.com/maps/api/js?sensor=false"type="text/javascript"></script></head><body><divid="map"style="width:550px;height:300px;"></div><scripttype="text/javascript">var myStyle =[{
featureType:"administrative",
elementType:"labels",
stylers:[{ visibility:"off"}]},{
featureType:"poi",
elementType:"labels",
stylers:[{ visibility:"off"}]},{
featureType:"water",
elementType:"labels",
stylers:[{ visibility:"off"}]},{
featureType:"road",
elementType:"labels",
stylers:[{ visibility:"off"}]}];var map =new google.maps.Map(document.getElementById('map'),{
mapTypeControlOptions:{
mapTypeIds:['mystyle', google.maps.MapTypeId.ROADMAP, google.maps.MapTypeId.TERRAIN]},
center:new google.maps.LatLng(30,0),
zoom:3,
mapTypeId:'mystyle'});
map.mapTypes.set('mystyle',new google.maps.StyledMapType(myStyle,{ name:'My Style'}));</script></body></html>
hides labels with country names.
To hide an area you have to create your own overlay – some polygon or overlay map type.
When you want to show only an area of the map, it might be also a good idea to limit viewable area of the map.
Sourabh Jain 