The '''Bavarian–Austrian Salt Treaty of 1829''' ({{lang-dein [[lingua tedesca|tedesco]] ''Konvention zwischen Bayern und Österreich über die beiderseitigen Salinenverhältnisse vom 18. März 1829}}'', shorto più brevemente ''Salinenkonvention'') is the eldest European [[treaty]] still in effect. It was signed by the [[Kingdom of Bavaria]] (now the [[Free State of Bavaria]]) and the [[Austrian Empire]] (now the [[Republic of Austria]]). It gave the Austrians the right to mine in Bavaria in exchange for wood. An agreement to this effect had already existed for 600 years, but was formally regulated by a treaty from 1829. The treaty was revised on 25 March 1957.<ref>Abkommen zwischen dem Freistaat Bayern und der Republik Österreich über die Anwendung der Salinenkonvention vom 25. März 1957 (Bayerisches Gesetz- und Verordnungsblatt 1958, S. 167)</ref>
