Answer :

Gibbs
Japan is densely populated because it is an island nation which means that there is not a lot of territory for the Japanese to spread out and inhabit. In addition Japan has a large population for the small territory that exists. A final reason is that much of life in Japan is centered around urban zones, which means that most of the population lives in these urban environments which are very dense. 
nyaosiemo
The reasons why Japan is densely populated are: 
1. It is an island nation which means that there is not a lot of territories for the Japanese to spread out and inhabit. 
2. Besides, Japan has a large population of the small area that exists.
3. A final reason is that much of life in Japan is centered around urban zones, which means that most of the population lives in these urban environments which are very dense.
Japan is three times more densely populated than Europe as a whole and 12 times more densely populated than the U.S.

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