Krottensee was formerly part of the German Empire. In the German Empire, the place was called Krottensee.
The place is now called Mokřina and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Krottensee | Austro-Hungary | Marienbad | before the Treaty of Saint-Germain |
| Krottensee | Czechoslovakia | Mariánské Lázně | after the Treaty of Saint-Germain |
| Krottensee | German Empire | Marienbad | 1938 |
| Mokřina | Czechoslovakia | Mariánské Lázně | 1945 |
| Mokřina | Czechoslovakia | Cheb | 1992 |
| Mokřina | Czech Republic | Cheb | 1993 |