Unterwarnow is the estuary of the Warnow River in Mecklenburg-Vorpommern, northern Germany. Connected with the Baltic Sea in Warnemünde. On the coasts of the estuary, the city of Rostock is located.

This article does not cite any sources. (September 2020) |
| Unterwarnow | |
|---|---|
View to the City of Rostock | |
| Location | Baltic Sea |
| Coordinates | 54°06′14.7″N 12°06′14.9″E |
| River sources | Warnow |
| Ocean/sea sources | Atlantic Ocean |
| Basin countries | Germany |
| Max. depth | 13 m (43 ft) |
| Salinity | ~10‰ |
| Settlements | Rostock |
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