| Kianida Reef | |
| Map: | Antarctica#South Shetland Islands |
| Map Relief: | yes |
| Location: | Antarctica |
| Coordinates: | -62.6422°N -61.2092°W |
| Archipelago: | South Shetland Islands |
| Area Ha: | 4 |
| Length M: | 350 |
| Width M: | 140 |
| Population: | uninhabited |
| Country: | None |
| Treaty System: | Antarctic Treaty System |
Kianida Reef (Bulgarian: риф Кианида|rif Kianida, in Bulgarian pronounced as /ˈrif kiɐˈnidɐ/) is the 350 m long in east-west direction and 140 m wide, narrowing to the east rocky reef lying in Osogovo Bay, off the southeast extremity of Rugged Island in the South Shetland Islands. Its surface area is 4 ha.[1] The area was visited by early 19th century sealers.[2]
The feature is named after the phantom island of Kianida or Cianeis off the Black Sea coast of Thrace, featured on a 1467 map by Nicolaus Germanus based on Claudius Ptolemy's Geography.[1]
Kianida Reef is located at -62.6422°N -61.2092°W, which is 440 m southwest of Radev Point, 1.65 km west-southwest of Astor Island and 3.5 km north-northwest of Devils Point on Livingston Island. Detailed Spanish mapping in 1992, and Bulgarian mapping in 2009 and 2017.