WADIS
| Date | Clue |
|---|---|
| 2019-02-08 | Desert gullies |
| 2012-12-01 | Desert gullies |
| 2011-11-12 | Relatives of arroyos |
| 1997-12-08 | African waterbeds |
| Date | Clue |
|---|---|
| 2019-02-08 | Desert gullies |
| 2012-12-01 | Desert gullies |
| 2011-11-12 | Relatives of arroyos |
| 1997-12-08 | African waterbeds |