Question: The city in which Calisto da Costa trained prior to his participation in the Sydney Olympic Games lies on which sea?

full_context: Document 1: Nauru at the 1990 Commonwealth Games: Nauru was represented at the 1990 Commonwealth Games in Auckland by a single athlete, weightlifter Marcus Stephen, who would later become his country's President in 2007. The 1990 Games marked Nauru's first participation in the Commonwealth Games. Stephen competed in three events only, and won medals in all three, including one gold.
Document 2: Nauru at the 2008 Summer Olympics: Nauru competed at the 2008 Summer Olympics, that were celebrated in Beijing, China, from August 8 to August 24, 2008. Nauru was represented by the Nauru Olympic Committee, and was the only nation out of 204 participating nations and territories that sent only a single athlete, and was one of 117 that won no medals at the Games. The sole athlete to represent the nation was Itte Detenamo, who participated in the weightlifting, and was the flag bearer in both the opening and closing ceremonies. This was the same number of athletes as at the 1996 Olympics, when Marcus Stephen (who later became President of Nauru) represented the country in the same sport, but was a decrease from the nation's last appearance at the Games when three athletes were sent to Athens. Nauru earned a berth for the weightlifting event in the Oceania and South Pacific Olympic Weightlifting Championships in 2008 and a chance to send participants in swimming and athletics events, but chose to send only a weightlifter. Itte Detenamo competed in the Group B of heavyweight class, fifteenth and last event of the weightlifting. He did not earn a medal, but finished with a personal best.
Document 3: Darwin City, Northern Territory: Darwin City (referred to as "Darwin city centre" or "The CBD" (Central Business District) is a suburb surrounded by metropolitan Darwin which comprises the original settlement, the central business district, parkland and other built-up areas. It is the oldest part of Darwin and includes many of the city's important institutions and landmarks, such as Parliament, Government House, the Northern Territory Supreme Court, Bicentennial Park and the George Brown Darwin Botanic Gardens. The city centre is located in the local government areas of the City of Darwin.
Document 4: Somalia at the 2016 Summer Olympics: Somalia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. The country's participation at Rio de Janeiro marked its ninth in the Summer Olympics since its debut in 1972. The delegation included two track and field athletes: sprinter Maryan Nuh Muse and long-distance runner Mohamed Daud Mohamed, who was the nation's flag bearer in the Parade of Nations. Neither athlete progressed past the first round of their respective competitions.
Document 5: Crime in the Northern Territory: Darwin has per capita the highest crime rate of any Australian city, while Alice Springs has the second highest crime rate of any Australian city (and the highest murder rate). Criminal activity is fought by the Northern Territory Police.
Document 6: Brinkin, Northern Territory: Brinkin is a northern suburb of Darwin, the capital city of the Northern Territory, Australia. It is located 12 km north of Darwin's central business district, and is home to the Casuarina campus of Charles Darwin University (formerly Northern Territory University's campus).
Document 7: Palmerston, Northern Territory: Palmerston is a planned satellite city of Darwin, the capital and largest city in Australia's Northern Territory. Palmerston is situated near Darwin Harbour and had a population of 27,618 at the 2011 census, making it the second largest city in the sparsely populated Northern Territory. Palmerston is currently the fastest growing city in the Northern Territory and has briefly in the past held the title of the fastest growing city in Australia.
Document 8: João Costa (sport shooter): João Carlos Calvete Pereira da Costa (born 28 October 1964 in Luanda, Angola) is a Portuguese sports shooter who competed in the Summer Olympic Games in 2000, 2004 and 2008. Costa has also qualified to compete in the men's 10 m air pistol event at the 2012 Summer Olympics. In the 2012 Olympic Competition, Costa placed 8th in the qualifying round with a score of 583. He placed 7th after the final with a combined score of 682.3.
Document 9: Konstantinos Kenteris: Konstantinos "Kostas" Kenteris, also spelled as Konstadinos "Costas" Kederis (Greek: Κωνσταντίνος "Κώστας" Κεντέρης ] ; born July 11, 1973) is a former Greek athlete. He won gold medals in the 200 metres at the 2000 Summer Olympics, the 2001 World Championships in Athletics and the 2002 European Championships in Athletics, making him the only European sprinter (along with Linford Christie) to win the gold medal in all three major competitions and the only European World Champion in the 200 metres races. Additionally, he has won two gold, three silver and two bronze medals in the European Cup, as well as three gold medals in the 200 metres at the Athens Grand Prix Tsiklitiria. He is also a 14-time golden medalist at the Greek Athletics Championships and a five-time golden medalist at the Greek Indoor Athletics Championships. He withdrew from the 2004 Summer Olympics, held in his home country, after a doping violation (failed to attend drug test).
Document 10: New Year Island (Northern Territory): New Year Island is an low-lying, uninhabited island in the Arafura Sea. It is part of the Northern Territory of Australia, and is 294 km north-east of Darwin, and 50 km east of Croker Island. It is approximately 2 km long, and 800 metres wide.
Document 11: Calisto da Costa: Calisto da Costa (born 6 February 1979) is a East Timorese athlete. He was one of the first athletes to represent East Timor at the Olympic Games, when he competed at the Men's Marathon at the 2000 Summer Olympics in Sydney, though he technically competed as an individual athlete because East Timor was newly independent and had not yet been formally recognized by the International Olympic Committee. Costa was one of the ten East Timorese athletes who received training in Darwin, Northern Territory prior to his participation in the Sydney Olympic Games. He finished in 71st place at 2:33:11.
Document 12: Darwin Correctional Centre: The Darwin Correctional Centre, an Australian minimum to maximum security prison for males and females, is approximately 30 km by road from Darwin, Northern Territory, Australia. The centre is managed by Northern Territory Department of Correctional Services, of the Government of the Northern Territory. The centre detains sentenced and charged felons under Northern Territory and/or Commonwealth law.
Document 13: Darwin, Northern Territory: is the capital city of the Northern Territory of Australia. Situated on the Timor Sea, Darwin is the largest city in the sparsely populated Northern Territory, with a population of 142,300. It is the smallest and most northerly of the Australian capital cities, and acts as the Top End's regional centre.
Document 14: Parliament House, Darwin: Parliament House in Darwin is Australia's newest Parliament Building, it has been the seat of the Northern Territory Legislative Assembly since 1994. Parliament House is located on State Square in the centre of Darwin, which is also the administrative centre of the Northern Territory law and government. It features Post modern features. The Northern Territory Library is housed in Parliament House.Construction of Parliament House began in 1990, and the building was completed in 1994, and officially opened by the Governor-General of Australia, Bill Hayden on 18 August 1994. Before Parliament House the former Northern Territory Legislative Council established in 1948 was housed in various temporary buildings around Darwin. After 1974 the Northern Territory Legislative Assembly continued to operate on the same basis, and settled in buildings on the current location until 1990 when they were demolished to allow commencement of the construction of Parliament House. From 1990 to the end of 1994, the Assembly temporarily met in the Chan Building.
Document 15: Victor Ramos (boxer): Victor Ramos (born 14 April 1970) is a retired East Timorese boxer. He was one of the first athletes to represent East Timor at the Olympic Games, when he competed at the Men's lightweight Boxing event at the 2000 Summer Olympics in Sydney, though he technically competed as an individual athlete because East Timor was newly independent and had not yet been formally recognized by the International Olympic Committee. He was also the flag bearer for the Independent Olympians at the 2000 Summer Olympics. Ramos was one of the ten East Timorese athletes who received training in Darwin prior to his participation in the Sydney Olympic Games. However, he lost in round 1 against Ghanaian boxer Raymond Narh and did not advance any further.
ground_truth: Timor Sea