At the link below you can find the correct borders of this area from the National Mapping Agency. Please correct – I do not know how it works. Thank you! 

https://wo.doris.at/weboffice/synserver?project=weboffice&stateID=5871f0f8-f8ad-4f3b-92da-7242588fa9bf&user=guest&group_id=guest&client=core