| Coordinates | 54°30′N 9°19′E |
|---|---|
| State | Schleswig-Holstein |
| District | Schleswig-Flensburg |
| Amt | Arensharde |
| Elevation | 5 |
| Area | 21.73 |
| Postal code | 24896 |
| Area code | 04626 |
| Licence | SL |
| Gemeindeschlüssel | 01 0 59 092 |
| Website | www.amt- silberstedt.de |
| Mayor | Carsten Görrissen |
Treia (Danish: Treja) is a municipality in the district of Schleswig-Flensburg, in Schleswig-Holstein, Germany.