double longitud = -8.756193515625D;
double latitud = 41.6482883125936;
CLLocationCoordinate2D coordinates = new CLLocationCoordinate2D(latitud,longitud);

// Retrieve the placemark on these new coords
MKReverseGeocoder reverseGeocoder = new MKReverseGeocoder(coordinates);
ReverseGeocoderDelegate geocoderDelegate = new ReverseGeocoderDelegate();
reverseGeocoder.Delegate = geocoderDelegate;
reverseGeocoder.Start();


private class ReverseGeocoderDelegate : MKReverseGeocoderDelegate
{
    public ReverseGeocoderDelegate(IntPtr handle) : base(handle) { }

    public ReverseGeocoderDelegate() : base()
    {
    }


    public override void FoundWithPlacemark (MKReverseGeocoder geocoder, MKPlacemark placemark)
    {
        string locationString = placemark.Title;
        if(String.IsNullOrEmpty(locationString))
        {
            locationString = placemark.Locality;
        }
    }

    public override void FailedWithError (MKReverseGeocoder geocoder, NSError error)
    {
    }
}