Old delta of Tamis river

 swamp, invisible

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The Timiş or Tamiš (Romanian: Timiş; Serbian: Тамиш; German: Temesch; Hungarian: Temes) is a 359 km long river rising in the Semenic Mountains, southern Carpathian Mountains. It flows through the Banat region and flows into the Danube near Pančevo. In antiquity, the river was known as Tibiscus and Tibisis.

The river starts at the junction of headwaters Brebu, Grădiştea and Semenic in Lake Trei Ape. After entering Banat, the river becomes slow and meandering. In its lower course, the river is regulated, and for the last 53 km it is navigable. The most important port is the heavily industrialized Pančevo.

The river's old mouth into the Danube was some 40 km to the north-west of Pančevo, between villages of Čenta and Surduk, thus it was shorter. Canal Karaš (cyrillic: Караш) remained marking old river bed, and the area bounded by the old and new river beds and the Danube, is called Pančevački Rit ("Marches of Pančevo", cyrillic: Панчевачки Рит). The 400 km² large wetland was constantly flooded, but since World War II it has been drained part by part and almost half of it is turned into a very fertile patch of land.

After being sparsely habited before 1930s, today its population density is above average for Serbia as a whole, since some of the fastest growing suburbs of Belgrade, Borča, Kotež and Krnjača are built there. The whole area of Pančevački Rit belongs administratively to Belgrade's municipality of Palilula.