Karlssorge was formerly part of the German Empire. In the German Empire, the place was called Karlssorge.
The place is now called Sapa and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Karlssorge | German Empire | Lyck | 1939 |
| Sapa | Under Polish administration | Ełk | 1945 |
| Sapa | Poland | Suwałki | 1992 |