Tvarditsa Rocks
Tvarditsa Rocks (, ) is a group of rocks off the north coast of Greenwich Island in the South Shetland Islands, Antarctica situated northeast of Ongley Island, southwest of Stoker Island and west of Sierra Island. The rocks are named after the town of Tvarditsa in southeastern Bulgaria. Location. Tvarditsa Rocks are located at (Bulgarian mapping in 2009). Maps. L.L. Ivanov. Antarctica: Livingston Island and Greenwich, Robert, Snow and Smith Islands. Scale 1:120000 topographic map. Troyan: Manfred Wörner Foundation, 2009.