Show only a specific world region on map

I want to show one part of t开发者_如何学Pythonhe world on a map. For example, I want to show only the cities and states in India; how can I do this?

Your question is badly worded but this example may help.

MKCoordinateRegion region;
MKCoordinateSpan span;

span.latitudeDelta=0.2;
span.longitudeDelta=0.2;
CLLocationCoordinate2D location = {latitude: 51.6657, longitude: 0.032563};

region.span=span;
region.center=location;

[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];