On 20 July 1925, Italy and the Kingdom of Serbs, Croats and Slovenes sign the Treaty of Nettuno — the agreement completing the 1924 Rome Arrangement on Fiume/Rijeka and clarifying border and minority issues on the Adriatic.

The treaty regulates the rights of Italians in Dalmatia, navigation and other dossiers left after the 1920 Treaty of Rapallo and the occupation of Fiume.

Signed at Nettuno on the Lazio coast, it was part of the effort to stabilise Italo-Yugoslav relations in the 1920s, before later tensions.

Ratification and application were complicated by domestic politics in both states; it nonetheless remains a milestone of interwar Adriatic diplomacy.

For Italy–Yugoslavia relations, 20 July 1925 marks the signing of the Treaty of Nettuno.

The text is documented in treaty collections and Adriatic historiography.

The Treaty of Nettuno of 20 July 1925 remains the reference for Italo-Yugoslav completions after Rapallo.

Image: Nettuno / Adriatic; Wikimedia Commons. Cropped to 16:9.

Source consulted: Treaty of Nettuno. Treaty text: Treaty of Nettuno (historical collection).