Related Clues:
- Broad mouths of rivers
- Brackish water locales
- River systems approaching the sea could become salted
- Foreign characters lasted with difficulty
- River areas
- River mouth landforms
- Symbols of change, in math
- Formations at mouths
- River mouth parts
- Areas at rivers' ends
- Where rivers divide before entering the sea
- Triangular landforms
- Greek characters given guidance about endless assignment
- Mouths with no teeth
- Wet mouth features?