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
Rate:
Last updated: January 22, 2018
You have not attempted this quiz yet.
First submittedJanuary 22, 2018
Times taken185
Average score83.3%
Report this quizReport
1:30
Enter city here
0
 / 6 guessed
The quiz is paused. You have remaining.
Scoring
You scored / = %
This beats or equals % of test takers also scored 100%
The average score is
Your high score is
Your fastest time is
Keep scrolling down for answers and more stats ...
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
+1
Level 65
Jan 22, 2018
And Mumbai
+1
Level 82
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 71
Jan 22, 2018
Megacities on islands....... Manhattan, Long, Staten are these not islands if not should we stop calling them islands?