Bergenthal was formerly part of the German Empire. In the German Empire, the place was called Bergenthal.
The place is now called Zielony Ostrów and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Bergenthal | German Empire | Gerdauen | 1939 |
| Zielony Ostrów | Under Polish administration | Kętrzyn | 1945 |
| Zielony Ostrów | Poland | Suwałki | 1992 |