Question: What is the size of the continent which contains a geological feature called The Fortress?

full_context: Document 1: The Fortress (Antarctica): The Fortress () is a platform of Beacon Supergroup in Victoria Land, Antarctica, dissected to form four promontories bordered by cliffs over high. Situated on the shoulder to the northeast of Webb Glacier, they form part of the divide between Webb Glacier and Victoria Upper Glacier. The feature was named by the Victoria University of Wellington Antarctic Expedition, 1959–60, for its fortress-like appearance.
Document 2: Ice sheet: The Antarctic ice sheet is the largest single mass of ice on Earth. It covers an area of almost 14 million km and contains 30 million km of ice. Around 90% of the Earth's ice mass is in Antarctica, which, if melted, would cause sea levels to rise by 58 meters. The continent - wide average surface temperature trend of Antarctica is positive and significant at > 0.05 ° C / decade since 1957.
Document 3: McLean Buttress: McLean Buttress () is a buttress-like mountain or promontory at the north side of Webb Lake and Barwick Valley in Victoria Land, Antarctica. It rises abruptly from the valley and marks the southern limit of the cliffs known as The Fortress. It was named by the Advisory Committee on Antarctic Names for Captain Frank E. McLean, United States Coast Guard, Commanding Officer of the in the Ross Sea during Operation Deep Freeze 1970 and 1971.
Document 4: Monastery Nunatak: Monastery Nunatak () is a spectacular isolated nunatak at the head of Ferrar Glacier, between Mount Feather and Pivot Peak, in Victoria Land, Antarctica. A cap of pale sandstone, with vertical walls, standing above a horizontal base of black dolerite, strongly suggests a Tibetan monastery. It was named by the New Zealand Northern Survey Party of the Commonwealth Trans-Antarctic Expedition of 1958–59.
Document 5: Wilkes Land: Wilkes Land is a large district of land in eastern Antarctica, formally claimed by Australia as part of the Australian Antarctic Territory, though the validity of this claim has been placed for the period of the operation of the Antarctic Treaty, to which Australia is a signatory. It fronts on the southern Indian Ocean between Queen Mary Coast and Adelie Land, extending from Cape Hordern in 100°31' E to Pourquoi Pas Point, in 136°11' E. The region extends as a sector about 2600 km towards the South Pole, with an estimated land area of 2,600,000 km², mostly glaciated. It is further subdivided in the following coastal areas which can also be thought of as sectors extending to the South Pole:
Document 6: Antarctica: Antarctica (US English i/æntˈɑːrktɪkə/, UK English /ænˈtɑːktɪkə/ or /ænˈtɑːtɪkə/ or /ænˈɑːtɪkə/)[Note 1] is Earth's southernmost continent, containing the geographic South Pole. It is situated in the Antarctic region of the Southern Hemisphere, almost entirely south of the Antarctic Circle, and is surrounded by the Southern Ocean. At 14,000,000 square kilometres (5,400,000 square miles), it is the fifth-largest continent in area after Asia, Africa, North America, and South America. For comparison, Antarctica is nearly twice the size of Australia. About 98% of Antarctica is covered by ice that averages 1.9 km (1.2 mi; 6,200 ft) in thickness, which extends to all but the northernmost reaches of the Antarctic Peninsula.
Document 7: Bolgar Buttress: Bolgar Buttress (, ‘Rid Bolgar’ \'rid 'bol-gar\) is the ice-covered buttress rising to 1500 m on the southeast side of Detroit Plateau on Nordenskjöld Coast in Graham Land, Antarctica, situated between the upper courses of Pyke and Albone Glaciers. It has steep and partly ice free west, south and east slopes.
Document 8: Mancho Buttress: Mancho Buttress (, ‘Rid Mancho’ \'rid 'man-cho\) is the ice-covered buttress rising to 1250 m on the northeast side of Detroit Plateau on Trinity Peninsula in Graham Land, Antarctica. It has precipitous and partly ice-free southwest slopes, and surmounts Aitkenhead Glacier to the southwest and south.
Document 9: Taylor Ledge: Taylor Ledge is a notable flat-topped ridge displaying abrupt cliffs north and south, situated between Boyce Ridge and Mount Shinn on the west slope of Sentinel Range, Ellsworth Mountains in Antarctica. The upper surface of the feature is ice covered and relatively level except for 3373-meter Knutzen Peak on the north edge.
Document 10: Antarctica: Antarctica is colder than the Arctic for three reasons. First, much of the continent is more than 3,000 m (9,800 ft) above sea level, and temperature decreases with elevation in the troposphere. Second, the Arctic Ocean covers the north polar zone: the ocean's relative warmth is transferred through the icepack and prevents temperatures in the Arctic regions from reaching the extremes typical of the land surface of Antarctica. Third, the Earth is at aphelion in July (i.e., the Earth is farthest from the Sun in the Antarctic winter), and the Earth is at perihelion in January (i.e., the Earth is closest to the Sun in the Antarctic summer). The orbital distance contributes to a colder Antarctic winter (and a warmer Antarctic summer) but the first two effects have more impact.
Document 11: Vee Cliffs: The Vee Cliffs are steep, mainly ice-covered cliffs, 7 km (4 nautical miles) long, between Aurora and the Terror Glacier on the south shore of Ross Island, Antarctica.
Document 12: Antarctica: About 98% of Antarctica is covered by the Antarctic ice sheet, a sheet of ice averaging at least 1.6 km (1.0 mi) thick. The continent has about 90% of the world's ice (and thereby about 70% of the world's fresh water). If all of this ice were melted, sea levels would rise about 60 m (200 ft). In most of the interior of the continent, precipitation is very low, down to 20 mm (0.8 in) per year; in a few "blue ice" areas precipitation is lower than mass loss by sublimation and so the local mass balance is negative. In the dry valleys, the same effect occurs over a rock base, leading to a desiccated landscape.
Document 13: Antarctica: Due to its location at the South Pole, Antarctica receives relatively little solar radiation. This means that it is a very cold continent where water is mostly in the form of ice. Precipitation is low (most of Antarctica is a desert) and almost always in the form of snow, which accumulates and forms a giant ice sheet which covers the land. Parts of this ice sheet form moving glaciers known as ice streams, which flow towards the edges of the continent. Next to the continental shore are many ice shelves. These are floating extensions of outflowing glaciers from the continental ice mass. Offshore, temperatures are also low enough that ice is formed from seawater through most of the year. It is important to understand the various types of Antarctic ice to understand possible effects on sea levels and the implications of global cooling.
Document 14: Vittoria Buttress: Vittoria Buttress () is a conspicuous rock cliff, rising to about 750 m, overlooking the southeast side of Lazarev Bay and forming the northwest extremity of the Lassus Mountains in northern Alexander Island, Antarctica. The feature was first mapped from air photographs taken by the Ronne Antarctic Research Expedition in 1947–48, by Searle of the Falkland Islands Dependencies Survey in 1960. Named by the United Kingdom Antarctic Place-Names Committee for Tomas Luis de Victoria (1535–1611), Spanish composer.
Document 15: Antarctica: Positioned asymmetrically around the South Pole and largely south of the Antarctic Circle, Antarctica is the southernmost continent and is surrounded by the Southern Ocean; alternatively, it may be considered to be surrounded by the southern Pacific, Atlantic, and Indian Oceans, or by the southern waters of the World Ocean. It covers more than 14,000,000 km2 (5,400,000 sq mi), making it the fifth-largest continent, about 1.3 times as large as Europe. The coastline measures 17,968 km (11,165 mi) and is mostly characterized by ice formations, as the following table shows:
ground_truth: 14,000,000 square kilometres
sub_queries: The Fortress >> continent Answer: Antarctica
What is the size of Antarctica ? Answer: 14,000,000 square kilometres