Related Clues:

• 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
• Where rivers end
• River mouth parts
• Areas at rivers' ends
• Where rivers divide before entering the sea
• Leaders to make overdone utterances though hardly speaking
• Triangular landforms
• Greek characters given guidance about endless assignment
• Mouths with no teeth
• Wet mouth features?