Related Clues:
- It's dammed at Iriklinsky
- ___ Mountains (Eurasia divider)
- Bermuda border
- It flows into the Caspian
- Vast amount
- River past Orsk
- Two-thirds of Earth
- Sound source
- River in the Russian Federation
- It makes a sound
- It has a floor but no ceiling
- Mermaid home
- Briny expanse
- Rivers' destination
- Atlantis cover, supposedly