Question: The city in which Calisto da Costa trained prior to his participation in the Sydney Olympic Games lies on which sea?
Related documents: [0]  [DOC] 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. [END] 
[1]  [DOC] 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. [END] 
Answer: 
Timor Sea
Timor Sea