Gyozan Maru
| Name | 日本海丸 Gyozan Maru |
| Alternative Reading | Gyosan Maru |
| Former Name | SS Hosang |
| Ship Type | Cargo Ship |
| Launched/Completed | 1922 |
| Builder | North Ireland Shipbuilding Co. Ltd., Londonderry |
| Tonnage | 5,698 tons |
| Owner | Imperial Japanese Navy |
| Loss Date | November 21, 1944 |
| Location | 10-30N, 115-08E |
| Circumstances | Hit by multiple torpedo attacks, rendered a total loss |
| Number of Men Lost | 21 crew members |
| Note | JANAC credits Flounder and USS Guavina (SS-362) for the distruction of this vessel. USS Bashaw (SS-241) may have hit Gyozan Maru earlier the same day. |
Submarine Information
| Name of Submarine | USS Flounder (SS-251) | Patrol Number 4 |
| Commanding Officer | CDR James E. Stevens | Attack No. 3151 |
Sinkings by Selected Submarines
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