Question: Canada-Denmark relations have attracted attention over the dispute over an island that is how long?

Context paragraphs:
Tasaday: The Tasaday (tɑˈsɑdɑj ) are an indigenous people of the Philippine island of Mindanao.  They are considered to belong to the Lumad group, along with the other indigenous groups on the island.  They attracted widespread media attention in 1971, when a journalist the Manila Associated Press bureau chief reported their discovery, amid apparent "stone age" technology and in complete isolation from the rest of Philippine society.  They again attracted attention in the 1980s when some accused the Tasaday living in the jungle and speaking in their dialect as being part of an elaborate hoax, and doubt was raised about their isolation and even about being a separate ethnic group.  The Tasaday language is distinct from that of neighbouring tribes, and linguists believe it probably split from the adjacent Manobo languages 200 years ago.

Donald Trump on social media: The presence of Donald Trump on social media has attracted attention worldwide since he joined Twitter in March 2009.  He has frequently used Twitter to comment on politicians and celebrities, and he relied on Twitter significantly to communicate during the 2016 United States presidential election.  The attention on Trump's Twitter activity has significantly increased since he was sworn in as the 45th President of the United States and continued to post controversial opinions and statements.  Many of the assertions made by Trump on his Twitter account have been proven to be false.

Cheon Yang-hee: Cheon Yang-hee (born January 21, 1942) is a South Korean poet.  She made her literary debut in 1965 while she was a student of Korean literature at Ewha Womans University.  She took a long hiatus in the early years of her career, and only began writing again in the 1980s.  Her output was prodigious in the 1990s and quickly attracted attention.  She is a lyric poet known for her deep reflections on people and existence.  She is the winner of the Sowol Poetry Award, Hyundae Literary Award, Gong Cho Literature Award, Park Dujin Literary Award, and Manhae Literature Prize.

Unbinilium: Unbinilium, also known as eka-radium or simply element 120, is the hypothetical chemical element in the periodic table with symbol Ubn and atomic number 120.  "Unbinilium" and "Ubn" are the temporary systematic IUPAC name and symbol, until a permanent name is decided upon.  In the periodic table of the elements, it is expected to be an s-block element, an alkaline earth metal, and the second element in the eighth period.  It has attracted attention because of some predictions that it may be in the island of stability, although newer calculations expect the island to actually occur at a slightly lower atomic number, closer to copernicium and flerovium.

Michael Cremo: Michael A. Cremo (born July 15, 1948), also known by his devotional name Drutakarmā dāsa, is an American freelance researcher who identifies himself as a Vedic creationist and an "alternative archeologist" and argues that humans have lived on Earth for millions of years.  In case of artifacts allegedly found in the Eocene auriferous gravels of Table Mountain, California and discussed in his book, "Forbidden Archeology", Cremo argues for the existence of modern man on Earth as long as 30 to 40 million years ago.  "Forbidden Archeology", which he wrote with Richard L. Thompson, has attracted attention from mainstream scholars who have criticized the views given on archeology and describe it as pseudoscientific.

Canada–Denmark relations: Canada–Denmark relations refers to the current and historical relations between Canada and Denmark.  Canada has an embassy in Copenhagen.  Denmark has an embassy in Ottawa and a consulate-general in Toronto.  Both countries are full members of NATO and the Arctic Council.  Relations between the two countries have attracted attention in light of the dispute over Hans Island.

Healing Church in Rhode Island: The Healing Church in Rhode Island is a Rhode Island-based religious sect whose adherents believe that cannabis (or marijuana) is a "holy herb" and use it in religious rituals.  Leaders of the group attracted attention in 2015 for attempting to smoke marijuana in front of the Roger Williams National Memorial (a memorial to Roger Williams, a pioneer of religious freedom and one of the smallest National Parks) as part of a religious service.  One of the church members said that bhang was consumed during the service on federal property, to avoid a no-smoking rule.  The following year, two leaders of the group were arrested and charged in connection with a marijuana grow operation.  Days before the arrest, the pair had filed a lawsuit in federal district court, contending that enforcement of state anti-marijuana laws against those who use marijuana for religious purposes violates the U.S. Constitution.

Allosaurus: Allosaurus ( ) is a genus of large theropod dinosaur that lived 155 to 150 million years ago during the late Jurassic period (Kimmeridgian to early Tithonian).  The name ""Allosaurus"" means "different lizard".  It is derived from the Greek ἄλλος /"allos" ("different, other") and σαῦρος /"sauros" ("lizard / generic reptile").  The first fossil remains that could definitively be ascribed to this genus were described in 1877 by paleontologist Othniel Charles Marsh.  These remains became known as "Antrodemus".  As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles.  Indeed, it has been a top feature in several films and documentaries about prehistoric life.

Hans Island: Hans Island (Greenlandic: "Tartupaluk"; Inuktitut: ᑕᕐᑐᐸᓗᒃ; French: "Île Hans" ] ; Danish: "Hans Ø" ) is a small, uninhabited barren knoll measuring 1.3 km2 , 1290 m long and 1199 m wide, located in the centre of the Kennedy Channel of Nares Strait—the strait that separates Ellesmere Island from northern Greenland and connects Baffin Bay with the Lincoln Sea.  Hans Island is the smallest of three islands located in Kennedy Channel; the others are Franklin Island and Crozier Island.  The strait is 35 km wide here, placing the island within the territorial waters of both Canada and Denmark.  A theoretical line in the middle of the strait goes through the island.

Unbiunium: Unbiunium, also known as eka-actinium or element 121, is the hypothetical chemical element with symbol Ubu and atomic number 121.  "Unbiunium" and "Ubu" are the temporary systematic IUPAC name and symbol, until a permanent name is decided upon.  In the periodic table of the elements, it is expected to be the first of the superactinides, and the third element in the eighth period: analogously to lanthanum and actinium, it could be considered the fifth member of group 3 and the first member of the fifth-row transition metals.  It has attracted attention because of some predictions that it may be in the island of stability, although newer calculations expect the island to actually occur at a slightly lower atomic number, closer to copernicium and flerovium.

Supporting paragraphs: Canada–Denmark relations Hans Island
Answer: 1290 m