Rhea
| Name | Rhea |
| Type | Steam merchant |
| GRT | 1,145 tons |
| Country |  Russian |
| Built | 1883 |
| Builder | Gourlay Bros, Dundee |
| Operator | Finska Ångfartygs A/B, Helsingfors |
| History | built as Isla, 1891 renamed Rhea |
U-boat attacks on Steam merchant Rhea
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 5 Sep 1915 | U 20 (Walther Schwieger) | Sunk | SW Fastnet | 48° 24'N, 7° 24'W | Valencia - Glasgow | fruit | 0 |
Position of attack on Rhea
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