Premstaetten, Styria, Austria - November 12, 2019: panorama of lake schwarzl (schwarzlsee), event location of the lake festival near the styrian capitol graz in austria. Lake resort complex.. Premstaetten, Styria, Austria - November 12, 2019: panorama of lake schwarzl (schwarzlsee), event location of the lake festival near the styrian capitol graz in austria. Lake resort complex