| Answer | Crossword Clue |
|---|---|
| ISL | Geographic formation: Abbr. |
| ISLE | Geographic formation. |
| ISLET | Geographic formation. |
| TER | Geographic area: Abbr. |
| RGS | Geographic society of London: Abbr. |
| ECH | Aircraft formation: Abbr. |
| ECH | Plane formation: Abbr. |
| ECH | Flight formation: Abbr. |
| ECH | Airplane formation: Abbr. |
| ECH | Flying formation: Abbr. |
