| Answer | Crossword Clue |
|---|---|
| TOM | Tributary of Ob. |
| TOM | Siberian river, tributary of Ob. |
| IRTISH | 2,200 mi. tributary of the Ob. |
| IRTYSH | Ob tributary |
| TOM | Ob tributary. |
| ALTAI | Mountainous source of the Ob |
| TOMSK | City E of the Ob. |
| TOMSK | City east of the Ob River |
| SEE | Missing letters in, and definition of, "OB. .RV." |
