| Answer | Crossword Clue |
|---|---|
| seifs | SEIF, a long, narrow sand dune |
| seif | a long, narrow sand dune |
| seif | long narrow sand dune parallel to the prevailing wind direction |
| seifs | long narrow sand dune parallel to the prevailing wind direction |
| esker | a long narrow ridge or mound of sand, gravel, and boulders deposited by a stream flowing on, within, or beneath a stagnant glacier |
