 Location of Snow Island in the South Shetland Islands | |
  Ballestilla Reef Location of Ballestilla Reef  Ballestilla Reef Ballestilla Reef (South Shetland Islands) | |
| Geography | |
|---|---|
| Location | Antarctica |
| Coordinates | 62°44′05″S 61°31′46″W / 62.73472°S 61.52944°W |
| Archipelago | South Shetland Islands |
| Area | 0.38 ha (0.94 acres) |
| Length | 160 m (520 ft) |
| Width | 40 m (130 ft) |
| Administration | |
| Administered under the Antarctic Treaty | |
| Demographics | |
| Population | uninhabited |
Ballestilla Reef (Bulgarian: риф Балестиля, romanized: rif Ballestilla, IPA: [ˈrif bɐlɛˈstilʲɐ]) is the 160 m long in southeast-northwest direction and 40 m wide flat and rocky low-tide elevation off the northwest coast of Snow Island in the South Shetland Islands, Antarctica. Its surface area is 0.38 ha. The vicinity was visited by early 19th century sealers.[1]
The feature is named after the geodetic instrument ballestilla, also known as Jacob's staff or cross-staff; in association with other names in the area deriving from the early development or use of geodetic instruments and methods.
