Nesebar Gap 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.

Simeon Peak (Bulgarian: връх Симеон, romanized: vrah Simeon, IPA: [ˈvrɤx simɛˈɔn]) rises to 1,580 m in Friesland Ridge, Tangra Mountains, Livingston Island in the South Shetland Islands, Antarctica. The peak is heavily glaciated, connected to St. Boris Peak to the northeast by Paril Saddle, and surmounts Huntress Glacier to the northwest, Ruen Icefall to the southwest, and Macy Glacier to the east. It was first ascended and GPS-surveyed by the Bulgarian climbers D. Boyanov, N. Petkov and N. Hazarbasanov from Nesebar Gap via the head of Huntress Glacier, Academia Peak, St. Boris Peak and Paril Saddle on 15 January 2017.

The peak is named after Czar Simeon the Great of Bulgaria, 893-927 AD.

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.

Huntress Glacier is a glacier 7 kilometres (4.3 mi) long and 3.7 kilometres (2.3 mi) wide flowing into the head of False Bay, Livingston Island in the South Shetland Islands, Antarctica. It is situated east of Johnsons Glacier, southeast of Contell Glacier and Balkan Snowfield, south of upper Perunika Glacier, southwest of Huron Glacier and northwest of Macy Glacier, and is bounded by Friesland Ridge and the Tangra Mountains to the southeast, Nesebar Gap, Pliska Ridge, Burdick Ridge and Willan Nunatak to the north, and Charrúa Gap and Napier Peak to the northwest.

The glacier was named by the UK Antarctic Place-Names Committee in 1958 after the American schooner Huntress (Captain Christopher Burdick) from Nantucket, which visited the South Shetland Islands in 1820–21 in company with the Huron of New Haven, Connecticut.

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.