ISTHMI
| Date | Clue |
|---|---|
| 2015-05-01 | Connecting strips |
| 2010-12-23 | Panama and Suez |
| 2007-12-05 | Panama and others |
| 2004-04-01 | Thin strips |
| 2002-03-04 | Panama and others |
| 2002-01-01 | Panama and others |
| 2001-02-23 | Strips on a map |
| 2000-04-04 | Connecting strips of land |
| 1994-01-28 | They're bicoastal |