Ballestilla Reef
Location of Snow Island in the 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 a 160m long (in the northeast-southwest direction) by 40m 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.
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.