| Place name (English): | Femsjøen |
| Place name (local language): | |
| Place name (alt. local language): | |
| Place name (older spelling): | |
| Place name (other common spelling/language): | |
| Place type: | lake |
| Is in the area of: | Halden |
| Note: |
| 1 | Niels Fuhrman Romedal (1758-1782), parents: Nicolay Abraham Romedal and Karen Fuhrman |