Megacities on Islands

Can you name the 6 urban agglomerations that are located on islands that have a population of at least 10 million?
According to city population.de; January 2017
Quiz by relessness
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Last updated: January 22, 2018
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First submittedJanuary 22, 2018
Times taken194
Average score83.3%
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Population
Country
Megacity
39.8 mil
Japan
Tokyo
28.9 mil
Indonesia
Jakarta
24.1 mil
Philippines
Manila
17.8 mil
Japan
Osaka
14.5 mil
United Kingdom
London
10.5 mil
Japan
Nagoya
3 Comments
+1
Level 65
Jan 22, 2018
And Mumbai
+1
Level 81
Jan 22, 2018
I'm guessing they're disqualified if the urban agglomeration isn't entirely on an island. Otherwise you'd have to count other cities that are partially on islands as well like Hong Kong and New York.
+1
Level 70
Jan 22, 2018
Megacities on islands....... Manhattan, Long, Staten are these not islands if not should we stop calling them islands?