 Location of Greenwich Island in the South Shetland Islands | |
  Tvarditsa Rocks Location on Antarctic Peninsula  Tvarditsa Rocks Location in Antarctica | |
| Geography | |
|---|---|
| Location | Antarctica |
| Coordinates | 62°24′39″S 59°52′06″W / 62.41083°S 59.86833°W |
| Archipelago | South Shetland Islands |
| Administration | |
| Administered under the Antarctic Treaty System | |
| Demographics | |
| Population | uninhabited |
Tvarditsa Rocks (Bulgarian: скали Твърдица, Bulgarian: ‘Skali Tvarditsa’ ska-'li tv&r-'di-tsa) is a group of rocks off the north coast of Greenwich Island in the South Shetland Islands, Antarctica situated 1.9 km (1.2 mi) northeast of Ongley Island, 1.3 km (0.81 mi) southwest of Stoker Island and 2.6 km (1.6 mi) west of Sierra Island.
The rocks are named after the town of Tvarditsa in southeastern Bulgaria.