| Rating | Solver | Clue |
|---|---|---|
| NADIR | Low-water mark | |
| LITTORAL | Inhabiting the seashore, esp. the zone between high-water and low-water mark. | |
| WATERMARK | A mark indicating the height to which water has risen, or at which it has stood; the usual limit of high or low water. | |
| SHALLOWNESS | Low water level |