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    <p>I adapted the answer from @Cyril Godefroy and added the conversion from <a href="https://stackoverflow.com/questions/6775718/how-to-make-the-union-between-two-mkcoordinateregion">How to make the union between two MKCoordinateRegion</a></p> <pre><code>- (MKMapRect) mapRectForCoordinateRegion:(MKCoordinateRegion)coordinateRegion { CLLocationCoordinate2D topLeftCoordinate = CLLocationCoordinate2DMake(coordinateRegion.center.latitude + (coordinateRegion.span.latitudeDelta / 2.0), coordinateRegion.center.longitude - (coordinateRegion.span.longitudeDelta / 2.0)); MKMapPoint topLeftMapPoint = MKMapPointForCoordinate(topLeftCoordinate); CLLocationCoordinate2D bottomRightCoordinate = CLLocationCoordinate2DMake(coordinateRegion.center.latitude - (coordinateRegion.span.latitudeDelta / 2.0), coordinateRegion.center.longitude + (coordinateRegion.span.longitudeDelta / 2.0)); MKMapPoint bottomRightMapPoint = MKMapPointForCoordinate(bottomRightCoordinate); MKMapRect mapRect = MKMapRectMake(topLeftMapPoint.x, topLeftMapPoint.y, fabs(bottomRightMapPoint.x - topLeftMapPoint.x), fabs(bottomRightMapPoint.y - topLeftMapPoint.y)); return mapRect; } - (void) addSquareToMap:(CLLocation*)center withRadius:(float)radius{ MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(center, radius*2, radius*2); MKMapRect rect = [self mapRectForCoordinateRegion:region]; MKMapPoint leftBottom = MKMapPointMake(MKMapRectGetMinX(rect), MKMapRectGetMinY(rect)); MKMapPoint leftTop = MKMapPointMake(MKMapRectGetMinX(rect), MKMapRectGetMaxY(rect)); MKMapPoint rightTop = MKMapPointMake(MKMapRectGetMaxX(rect), MKMapRectGetMaxY(rect)); MKMapPoint rightBottom = MKMapPointMake(MKMapRectGetMaxX(rect), MKMapRectGetMinY(rect)); MKMapPoint rect[4] = {leftBottom, leftTop, rightTop, rightBottom}; MKPolygon *polygon = [MKPolygon polygonWithPoints:rect count:4]; poly.title = @"Square"; // Add it to the map [map addOverlay:poly]; } - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id &lt;MKOverlay&gt;)overlay{ if ([overlay isKindOfClass:[MKPolygon class]]){ MKPolygonView* aView = [[[MKPolygonView alloc] initWithPolygon:(MKPolygon*)overlay] autorelease]; aView.fillColor = [[UIColor redColor] colorWithAlphaComponent:0.15]; aView.strokeColor = [[UIColor redColor] colorWithAlphaComponent:0.7]; aView.lineWidth = 3; return aView; } return nil; } </code></pre>
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    1. COI'd say that the way you do it is overthinking it. I understand that the issue is to go from meters to degrees. A simpler MKCoordinateRegionMakeWithDistance should help you have more robust and understandable code.
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