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Τάναϊς Танаис | |
 The archaeological park of Tanais. May 2017 | |
  Shown within Rostov Oblast .svg) Tanais (European Russia) | |
| Location | Nedvigovka, Rostov Oblast, Russia |
|---|---|
| Region | Maeotian marshes |
| Coordinates | 47°16′8″N 39°20′6″E / 47.26889°N 39.33500°E |
| Type | Settlement |
| History | |
| Builder | Settlers from Miletus |
| Founded | Late 3rd century BC |
| Abandoned | Second half of the 5th century AD |
| Periods | Hellenistic to Late Antiquity |
| Cultures | Greek, Sarmatian |
| Site notes | |
| Condition | Ruined |
| Ownership | Public |
| Public access | Yes |
| Website | museum-tanais |
Tanais (Greek: Τάναϊς Tánaïs; Russian: Танаис) was an ancient Greek city in the Don river delta, called the Maeotian marshes in classical antiquity. It was a bishopric as Tana and remains a Latin Catholic titular see as Tanais.