The Adige (Italian: [ˈaːdidʒe]; German: Etsch [ɛtʃ] ⓘ; Venetian: Àdexe [ˈadeze]; Romansh: Adisch [ɐˈdiːʃ] ⓘ; Ladin: Adesc; Latin: Athesis; Ancient Greek: Ἄθεσις, romanized: Áthesis, or Ἄταγις, Átagis[1]) is the second-longest river in Italy, after the Po.

It rises near the Reschen Pass in the Vinschgau in the province of South Tyrol, near the Italian border with Austria and Switzerland, and flows 410 kilometres (250 mi) through most of northeastern Italy to the Adriatic Sea.

[2] Nineteenth-century theories, such as a derivation from the Proto-Celtic *yt-ese 'the water', and alleged to be cognate with the River Tees in England (anciently Athesis, Teesa),[3] have never been accepted by Celtic onomasts and are now completely obsolete.

The river source is near the Reschen Pass (1,504 metres (4,934 ft)) close to the borders with Austria and Switzerland above the Inn Valley.

The Adige crosses Trentino and later Veneto, flowing past the town of Rovereto, the Lagarina Valley, the cities of Verona and Rovigo and the north-eastern part of the Po Plain into the Adriatic Sea.