Related Clues:
- Triangular letters
- Some fertile regions
- River formations
- Some bodies of water
- River features
- Triangular deposits
- River plains named for their usual shape
- Rivers' mouths
- Tropical spots
- Greek D's
- Nile and Mississippi
- Seaside ponds
- Pointed river formations
- River areas named for their shape
- The Mekong and Nile have them