Bransfield Strait in the context of "Scotia Arc"

Friesland Ridge (Hrebet Frisland \'hre-bet 'fris-land\) is a ridge on Livingston Island in the South Shetlands, part of the Tangra Mountains. The summit, Mount Friesland, which rises to 1,700 metres (5,600 ft), is the northwesternmost of the ridge's six main peaks. Its elevation was estimated at 1,684 metres (5,525 ft) by a 1995/96 Bulgarian survey; the present figure was produced by a 2003 Australian GPS survey, and closely matched (as 1,702 metres (5,584 ft)) by the Bulgarian survey Tangra 2004/05.

The local ice relief is subject to changes, causing variations in the mountain peaks’ elevation. According to a Bulgarian GPS survey by D. Boyanov and N. Petkov the elevation of Mt. Friesland was 1,693 metres (5,554 ft) in December 2016, making the peak lower than the adjacent St. Boris Peak (the latter's northernmost ice formation ‘The Synagogue’ rising to 1,699 metres (5,574 ft)) at that time.

Tangra Mountains (in Bulgarian Тангра планина, 'Tangra planina' \'tan-gra pla-ni-'na\) (62°40′00″S 60°06′00″W / 62.66667°S 60.10000°W / -62.66667; -60.10000) form the principal mountain range of Livingston Island in the South Shetland Islands, Antarctica. The range had been nameless until 2001, when it was named after Tengri (Bulgarian Tangra), "the name of the ancient Bulgarian god."

Tangra Mountains are 32 kilometres (20 mi) long between Barnard Point and Renier Point, 8.5 kilometres (5.3 mi) wide, and are bounded by Moon Bay and Huron Glacier to the north, Huntress Glacier to the northwest, False Bay to the west, and Bransfield Strait to the southeast, and is linked to Bowles Ridge by Wörner Gap, and to Pliska Ridge by Nesebar Gap. The mountain is divided in three principal ridges: Friesland Ridge in the west, Levski Ridge in the centre, and Delchev Ridge in the east.

Tarnovo Ice Piedmont (Bulgarian: ледник Търново, romanized: lednik Tarnovo, IPA: [ˈlɛdnik ˈtɤrnovo]) is an ice piedmont on Rozhen Peninsula, Livingston Island in the South Shetland Islands, Antarctica is situated southeast of Charity Glacier and west-southwest of Prespa Glacier. It extends 3.5 km in east-west direction and 2.5 km in north-south direction, is bounded to the west by Veleka Ridge, to the north by Arda Peak, Gerov Pass and Shumen Peak, and to the east by Yambol Peak, and flows southeastwards into Bransfield Strait east of Botev Point and west of Gela Point.

The feature is named after the city of Tarnovo (Veliko Tarnovo) in northern Bulgaria, the capital of the medieval Second Bulgarian Empire.

Astrolabe Island (63°17′S 58°40′W / 63.283°S 58.667°W / -63.283; -58.667 (Astrolabe Island)) is an island 3 nautical miles (5.6 km; 3.5 mi) long, lying in the Bransfield Strait 14 nautical miles (26 km; 16 mi) northwest of Cape Ducorps, Trinity Peninsula in Antarctica.

Tundzha Glacier (Bulgarian: ледник Тунджа, romanized: lednik Tundzha, IPA: [ˈlɛdnik ˈtund͡ʒɐ]) is a glacier on Livingston Island in the South Shetland Islands, Antarctica situated east-southeast of Berkovitsa Glacier, west of Saedinenie Snowfield, northwest of Pimpirev Glacier, north of Kamchiya Glacier, and east-northeast of Verila Glacier. It is bounded by Snow Peak to the west, Teres Ridge to the east and the glacial divide between the Drake Passage and Bransfield Strait to the south. The glacier extends 7.5 nautical miles (13.9 km; 8.6 mi) in east-west direction and 2.4 nautical miles (4.4 km; 2.8 mi) in the north-south direction, and drains northwards into Hero Bay between Avitohol Point and Siddins Point.

The feature was named after the Tundzha River in Bulgaria.

Rozhen Peninsula (Bulgarian: полуостров Рожен, romanized: poluostrov Rozhen, IPA: [poɫuˈɔstrof ˈrɔʒɛn]) extends 9 km in the southwest direction towards Barnard Point, Livingston Island in the South Shetland Islands, Antarctica, and 8.8 km wide. It is bounded by False Bay and its segment Inept Cove to the west, Bransfield Strait to the southeast and Brunow Bay to the east. Its interior is occupied by the Friesland Ridge of Tangra Mountains.

The peninsula is named after Rozhen site in Pirin Mountain, Bulgaria.

St. Methodius Peak (Bulgarian: връх Св. Методий, romanized: vrah Sv. Metodiy, IPA: [ˈvrɤx svɛˈti mɛˈtɔdij]) rises to approximately 1,180m in Friesland Ridge, Tangra Mountains, Livingston Island, Antarctica and surmounts Ruen Icefall to the north-northwest, Prespa Glacier to the southeast and Charity Glacier to the southwest. Linked to St. Cyril Peak by Vladaya Saddle.

The peak is named after St. Methodius (815-885 AD).

Botev Peak (Bulgarian: Ботев връх, romanized: Botev vrah, IPA: [ˈbɔtɛv ˈvrɤx]) is a peak rising to about 370 m in the southern extremity of the Veleka Ridge of Tangra Mountains, eastern Livingston Island in the South Shetland Islands, Antarctica overlooking Tarnovo Ice Piedmont to the east-northeast, Botev Point to the south, Barnard Point to the west and Arkutino Beach to the northwest. The feature takes its name from the adjacent Botev Point.

Lyaskovets Peak (Bulgarian: връх Лясковец, romanized: vrah Lyaskovets, IPA: [ˈvrɤx ˈʎaskovɛt͡s]) is the easternmost peak of Friesland Ridge in the Tangra Mountains, eastern Livingston Island and has an elevation of 1,473 m. The peak is bounded by Catalunyan Saddle on the west and Shipka Saddle on the east, and is heavily glaciated and crevassed, with precipitous western, southern and eastern slopes. It surmounts Huron Glacier to the northwest and northeast, and Macy Glacier and Brunow Bay area to the south. Its northern offshoot forms Zograf Peak, and is linked to Lozen Nunatak, Erma Knoll and Aheloy Nunatak in Huron Glacier.

The peak is named after Lyaskovets, a town in central northern Bulgaria.