| Answer | Crossword Clue |
|---|---|
| ACME | High-water mark |
| FLOODLINE | High-water mark |
| BUOY | Water mark? |
| NADIR | Low-water mark |
| rillmark | a water mark |
| rillmarks | RILLMARK, a water mark |
| ETIAGE | Low-water mark: Fr. |
| ICELINE | Graph mark between frozen and liquid water. |
| buoy | floating object moored to the bottom to mark a channel or something (as a shoal) lying under the water |
