Question: what latitude is at the border of the continent where Grinder Island can be found?

full_context: Document 1: Leningradskiy Island: Leningradskiy Island is an ice-covered island situated at the head of Leningradskiy Bay at the western margin of the Lazarev Ice Shelf, Queen Maud Land, Antarctica. The feature rises nearly above the general level of the ice shelf which surrounds all but the northern side. It was discovered and mapped by the Soviet Antarctic Expedition in 1961, and named in association with Leningradskiy Bay.
Document 2: Edwards Islands (Enderby Land): The Edwards Islands are a group of islands in the east side of Amundsen Bay, about southwest of Mount Oldfield in Enderby Land. They were plotted from air photos taken from Australian National Antarctic Research Expeditions aircraft in 1956, and were named by the Antarctic Names Committee of Australia for T. Edwards, an assistant diesel mechanic at Wilkes Station in 1960.
Document 3: Swinburne Ice Shelf: The Swinburne Ice Shelf (), is an ice shelf just north of Edward VII Peninsula and the Alexandra Mountains in the southern part of Sulzberger Bay, Antarctica. The ice shelf is 20 miles long and 5 miles wide and extends from Fisher Island to White Islands. It was photographed from aircraft and mapped by the Byrd Antarctic Expedition (ByrdAE), 1928-30. Named by Advisory Committee on Antarctic Names (US-ACAN) for Captain H.W Swinburne, Jr., Deputy Commander and Chief of Staff, U.S. Naval Support Force, Antarctica, during Operation Deep Freeze 1970 and 1971.
Document 4: Antarctica: In 1983, the Antarctic Treaty Parties began negotiations on a convention to regulate mining in Antarctica. A coalition of international organizations launched a public pressure campaign to prevent any minerals development in the region, led largely by Greenpeace International, which established its own scientific station—World Park Base—in the Ross Sea region and conducted annual expeditions to document environmental effects of humans on Antarctica. In 1988, the Convention on the Regulation of Antarctic Mineral Resources (CRAMRA) was adopted. The following year, however, Australia and France announced that they would not ratify the convention, rendering it dead for all intents and purposes. They proposed instead that a comprehensive regime to protect the Antarctic environment be negotiated in its place. The Protocol on Environmental Protection to the Antarctic Treaty (the "Madrid Protocol") was negotiated as other countries followed suit and on 14 January 1998 it entered into force. The Madrid Protocol bans all mining in Antarctica, designating Antarctica a "natural reserve devoted to peace and science".
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: 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 7: Antarctica: New claims on Antarctica have been suspended since 1959 although Norway in 2015 formally defined Queen Maud Land as including the unclaimed area between it and the South Pole. Antarctica's status is regulated by the 1959 Antarctic Treaty and other related agreements, collectively called the Antarctic Treaty System. Antarctica is defined as all land and ice shelves south of 60° S for the purposes of the Treaty System. The treaty was signed by twelve countries including the Soviet Union (and later Russia), the United Kingdom, Argentina, Chile, Australia, and the United States. It set aside Antarctica as a scientific preserve, established freedom of scientific investigation and environmental protection, and banned military activity on Antarctica. This was the first arms control agreement established during the Cold War.
Document 8: National Antarctic Program: Till date 48 countries have signed the Antarctic Treaty which was drafted and negotiated back in 1959. Out of these, only 28 countries have the Consultative status i.e. these Parties have the right to participate in Antarctic Treaty Consultative Meetings (ATCM) and are accordingly known as Consultative Parties and their presence in Antarctica is shown by carrying substantial research there.
Document 9: Stonington Island: Stonington Island is a rocky island lying northeast of Neny Island in the eastern part of Marguerite Bay off the west coast of Graham Land, Antarctica. It is long from north-west to south-east and wide, yielding an area of . It was formerly connected by a drifted snow slope to Northeast Glacier on the mainland. Highest elevation is "Anemometer Hill" which rises to .
Document 10: Grinder Island: Grinder Island is one of the ice-covered islands in the Marshall Archipelago, located within the Sulzberger Ice Shelf off the coast of Marie Byrd Land, Antarctica. The island is long and wide and lies southwest of Steventon Island. It was mapped by the United States Geological Survey from surveys and U.S. Navy air photos, 1959–65, and was named by the Advisory Committee on Antarctic Names for Harry W. Grinder, a U.S. Navy aviation structural mechanic of McMurdo Station, 1967.
Document 11: Australian Antarctic Data Centre: Article III.1.c of the Antarctic Treaty states that "to the greatest extent feasible and practicable" ... "scientific observations and results from Antarctica shall be exchanged and made freely available"
Document 12: Dream Island: Dream Island is an island lying south-east of Cape Monaco, off the south-west coast of Anvers Island in Wylie Bay, in the Palmer Archipelago of Antarctica. It was surveyed by the British Naval Hydrographic Survey Unit in 1956-1957 and named by the UK Antarctic Place-Names Committee for its natural features including a cave and, in summer, a small waterfall, with mossy patches and grass. It lies about 10 km north-west of the United States' Palmer Station.
Document 13: Breaker Island: Breaker Island is a small rocky island lying in Arthur Harbour close south-west of Norsel Point, off the south-west coast of Anvers Island in the Palmer Archipelago of Antarctica. It was surveyed by the Falkland Islands Dependencies Survey (FIDS) in 1955 and named by the UK Antarctic Place-Names Committee (UK-APC) because the island causes breakers when the sea is rough.
Document 14: Cruzen Island: Cruzen Island is a rocky, but mostly snow-covered island about north-northeast of the mouth of Land Glacier off the coast of Marie Byrd Land, Antarctica. It was discovered in 1940 on aerial flights from the West Base of the US Antarctic Service, and named for Commander Richard Cruzen, US Navy, the commanding officer of the USS "Bear" and second in command of the expedition.
Document 15: Antarctica: The Protocol on Environmental Protection to the Antarctic Treaty (also known as the Environmental Protocol or Madrid Protocol) came into force in 1998, and is the main instrument concerned with conservation and management of biodiversity in Antarctica. The Antarctic Treaty Consultative Meeting is advised on environmental and conservation issues in Antarctica by the Committee for Environmental Protection. A major concern within this committee is the risk to Antarctica from unintentional introduction of non-native species from outside the region.
ground_truth: south of 60° S
sub_queries: Grinder Island >> continent Answer: Antarctica
What latitude is defined as being Antarctica 's border? Answer: south of 60° S