Bowles Ridge in the context of "Mount Friesland"

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.

Perunika Glacier (Bulgarian: ледник Перуника, romanized: lednik Perunika, IPA: [ˈlɛdnik pɛroˈnikɐ]) is an 8 km long and 3 km wide (average) roughly crescent-shaped glacier in eastern Livingston Island in the South Shetland Islands, Antarctica situated east of Pimpirev Glacier, south of Saedinenie Snowfield, southwest of Kaliakra Glacier, west of Huron Glacier, and north of Balkan Snowfield and the head of Huntress Glacier.

Its head is bounded by Pliska Ridge to the south-southwest, Nesebar Gap to the south, Wörner Gap to the east, and Bowles Ridge to the north-northeast. It drains northwestwards between Burdick Ridge and Bowles Ridge, then north of Rezen Knoll turns west-southwest and flows into the head of Emona Anchorage between Bulgarian Beach and Pimpirev Beach.

The Tangra 2004/05 Expedition was commissioned by the Antarctic Place-names Commission at the Ministry of Foreign Affairs of Bulgaria, managed by the Manfred Wörner Foundation, and supported by the Bulgarian Antarctic Institute, the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences, Bulgarian Posts, Uruguayan Antarctic Institute, Peregrine Shipping (Australia), and Petrol Ltd, TNT, Mtel, Bulstrad, Polytours, B. Bekyarov and B. Chernev (Bulgaria).

Kuzman Knoll (Kuzmanova Mogila \'kuz-ma-no-va mo-'gi-la\) is a solitary ice-covered knoll rising to 620 m in eastern Livingston Island in the South Shetland Islands, Antarctica. The knoll forms a conspicuous landmark in Wörner Gap area, overlooking Huron Glacier and upper Perunika Glacier. It was named after Kuzman Tuhchiev, participant in the 1993/94 Bulgarian Antarctic campaign and base commander at St. Kliment Ohridski during the 1994-96 seasons.

The feature is named ‘Tukhchiev Knoll’ by the U.S. and British Antarctic naming committees; "Kuzman Knoll" is the official Bulgarian name, which is established among the Spanish and Bulgarian scientists working in the area.

Huron Glacier is a 4.8 nautical miles (8.9 km; 5.5 mi)} long and 2.2 nautical miles (4.1 km; 2.5 mi) wide glacial flow on Livingston Island in the South Shetland Islands of Antarctica, situated east of Perunika Glacier, southeast of Kaliakra Glacier, south of Struma Glacier, west-northwest of Iskar Glacier and northeast of Huntress Glacier. It is bounded by Bowles Ridge to the north, Wörner Gap to the west and the Tangra Mountains to the south, receiving ice influx from several tributary glaciers draining the mountain's northern slopes between Mount Friesland and Helmet Peak, and running east-northeastwards to empty into Moon Bay north of Yana Point. Camp Academia is situated on upper Huron Glacier, in the northwestern foothills of Zograf Peak.

The glacier was named by the UK Antarctic Place-names Committee in 1958 after the American ship Huron (Captain John Davis) of New Haven, Connecticut, which visited the South Shetland Islands in 1820–21 and 1821–22.

Wörner Gap (Sedlovina Wörner \se-dlo-vi-'na 'vyor-ner\) is a flat saddle extending 3 km in the south-north direction between Friesland Ridge and Bowles Ridge in eastern Livingston Island in the South Shetland Islands, Antarctica. Its elevation decreases from 585 m in the south to 541 m in the middle, and 525 m in the north. The gap separates the glacial catchments of Perunika Glacier to the west and Huron Glacier to the east, and is linked to the east to Kuzman Knoll, a conspicuous landmark in the area. The gap is visited by field parties from St. Kliment Ohridski Base and Juan Carlos I Base and is subject to Spanish and Bulgarian glaciological studies.

The feature is named after the late Secretary General of the Atlantic Alliance Dr. Manfred Wörner (1934–94) in recognition of his contribution to European unity.

Pliska Ridge (Bulgarian: връх Плиска, romanized: vrah Pliska, IPA: [ˈvrɤx ˈpliskɐ]) is a three-peaked ridge rising to 667 m (2,188 ft) in eastern Livingston Island in the South Shetland Islands, Antarctica. Its central and highest summit, Pliska Peak, is located 2.48 km (1.54 mi) east-northeast of Willan Nunatak (449 m (1,473 ft)), 1.81 km (1.12 mi) southeast of Burdick Peak (773 m (2,536 ft), summit of Burdick Ridge), 3.53 km (2.19 mi) south-southwest of Mount Bowles, 3.68 km (2.29 mi) west-southwest of Kuzman Knoll, and 3.61 km (2.24 mi) northwest of Mount Friesland. The feature is 1.6 km (0.99 mi) long and 500 m (1,600 ft) wide, its axis trending due east-west, with precipitous southern slopes. It is ice-covered except for segments of its easternmost peak (646 m (2,119 ft)) and is bounded to the northwest by Orpheus Gate, to the north by the head of Perunika Glacier, to the east by Nesebar Gap, and to the south and west by the head of Huntress Glacier, the latter flowing 6 km (3.7 mi) southwestwards into False Bay.

First ascent by the Bulgarian Lyubomir Ivanov from Camp Academia on 18 December 2004.