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

Context paragraphs:
Sydney Olympic Park Hockey Centre: The Sydney Olympic Park Hockey Centre, also known as the State Hockey Centre of New South Wales is a multi-use stadium in Sydney, Australia.  It was built in 1998 as part of Sydney Olympic Park sporting complex, having held matches for the field hockey events at the 2000 Summer Olympics.  Its current capacity is 8,000 people, with seating capacity for 4,000.  For the Sydney Olympic Games capacity was boosted to 15,000 through the use of temporary stands.

North Sydney Olympic Pool: The North Sydney Olympic Pool is a swimming and exercise complex located adjacent to Sydney Harbour at Milsons Point in North Sydney between the Sydney Harbour Bridge and Luna Park.  Designed by architects Rudder & Grout in the Inter-War Free Classical style with art deco-style decorations, the Olympic-sized outdoor pool was built on part of the Dorman Long workshops site following the completion of the Harbour Bridge.  The pool opened 4 April 1936 and hosted the swimming and diving events for the 1938 Empire Games.  Heating was added in 2000 and a 25m indoor pool was added in 2001.  Despite the name, it was not the aquatic venue for the 2000 Sydney Olympic Games; the aquatic events took place at the Sydney International Aquatic Centre in Sydney Olympic Park.

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.

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.

Stadium Australia: Stadium Australia, commercially known as ANZ Stadium and formerly as Telstra Stadium, is a multi-purpose stadium located in the Sydney Olympic Park, in Sydney, Australia.  The stadium, which in Australia is sometimes referred to as Sydney Olympic Stadium, Homebush Stadium or simply as the Olympic Stadium, was completed in March 1999 at a cost of A$690 million to host the 2000 Summer Olympics.  The current chairman of the stadium's Advisory Board is Robert Webster.  Every year since the stadium was built, the New South Wales rugby league team's home games in the State of Origin series have been played there.  Also the stadium has since hosted the annual National Rugby League grand final.  ANZ Stadium also hosted the 2003 Rugby World Cup finals and Bledisloe Cup matches, regular Sydney Swans and Greater Western Sydney Giants AFL matches, as well as international soccer matches featuring Australia's national team the Socceroos, and exhibition games by Sydney-based A-League team Sydney FC.  The stadium also hosted the 2015 AFC Asian Cup final.

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.

Stéphane Da Costa: Stéphane Da Costa (born 11 July 1989) is a French-Polish professional ice hockey player currently an unrestricted free agent.  He most recently played for CSKA Moscow of the Kontinental Hockey League (KHL).  Born in France, Da Costa moved to the United States as a junior to develop as a player.  After junior, Da Costa moved on to NCAA collegiate hockey, playing two seasons with Merrimack College.  He then signed as a free agent with the National Hockey League (NHL)'s Ottawa Senators in 2011, and played three seasons in the organization, including 47 games with Ottawa.  In 2014, he left the organization as a free agent, signing with CSKA Moscow.

Sydney Olympic Park: Sydney Olympic Park is a large sports and entertainment complex in western Sydney.  It is also an official suburb of Sydney, commonly known as Olympic Park but officially named Sydney Olympic Park.  Sydney Olympic Park is located 16 kilometres west of the Sydney central business district, in the local government area of City of Parramatta.

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.

Lucina da Costa Gomez-Matheeuws: Lucina Elena da Costa Gomez-Matheeuws (5 April 1929 – 7 January 2017) was a Dutch Antillean politician for the National People's Party (PNP).  She served as the Prime Minister of the Netherlands Antilles, an office her husband Moises Frumencio da Costa Gomez previously held, briefly in 1977.  She was also the first female to hold the office.  Prior to this, she was the Minister of Health and Environment, Welfare, Youth, Sports, Culture and Recreation (1970–1977).

Supporting paragraphs: Calisto da Costa Darwin, Northern Territory
Answer: Timor Sea