| Gulf of Ob | |
|---|---|
| О́бская губа́ Error {{native name checker}}: parameter value is malformed (help) | |
Map showing the location of the Gulf of Ob. | |
| Location | Far North |
| Coordinates | 68°50′N 73°30′E / 68.833°N 73.500°E |
| River sources | Ob River |
| Ocean/sea sources | Kara Sea |
| Basin countries | Russia |
| Average depth | 10–12 m (33–39 ft) |
| Official name | Islands in Ob Estuary, Kara Sea |
| Designated | 13 September 1994 |
| Reference no. | 676 |
The Gulf of Ob (Russian: Обская губа, romanized: Obskaya guba; also known as Bay of Ob, Russian: Обский залив, romanized: Obsky zaliv) is a bay of the Arctic Ocean. It is in Northern Russia at the mouth of the Ob River. It is the world's longest estuary.