The border between the modern states of Austria and Germany (German: Grenze zwischen Deutschland und Österreich) has a length of 815.9 km (507.0 mi), or 817.0 km (507.7 mi) respectively. It is the longest international border of Austria and the tied longest border of Germany with another country (the other one being the border with the Czech Republic, with the same length of 817 km (508 mi)).
