| Answer | Crossword Clue |
|---|---|
| CALDERA | Depression at the mouth of a volcano |
| LIMAN | Bay at the mouth of a river |
| SILT | Deposit at the mouth of a river |
| DELTA | Buildup at the mouth of a river |
| YSSEL | A mouth of the Rhine, at Zuyder Zee. |
| PLATTE | River facetiously described as "a mile wide at the mouth, but only six inches deep" |
