| Clue | Source | Date |
|---|---|---|
| Arctic plains | Newsday | 20 Aug 2023 |
| Arctic plains | Eugene Sheffer | 29 May 2021 |
| Vast frozen expanses | Universal | 19 Sep 2016 |
| Vast frozen expanses | ||
| Frozen expanses | Wall Street Journal | 17 Nov 2015 |
| Frozen expanses | ||
| Arctic wastelands | ||
| Frozen expanses | ||
| Siberian expanses | ||
| Permafrost regions | ||
| Arctic plains | ||
| Arctic plains | ||
| Arctic plains | ||
| Permafrost areas | ||
| Frozen expanses | ||
| Arctic wastes | ||
| Permafrost plains | ||
| Permafrost lands |