| Answer | Crossword Clue |
|---|---|
| RIA | River valley formation |
| BUTTE | Monument Valley formation |
| MESA | Monument Valley formation |
| MESA | Monument Valley land formation |
| DELTA | River formation |
| DELTA | Triangular river formation |
| DELTA | River mouth formation |
| DELTA | River-mouth formation |
| DELTA | Sand formation at river mouth. |
