Official Nagoya Subway network map.

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The Nagoya Subway network map on Wikipedia shows the Meijō Line as a perfect circle.

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Another Nagoya subway map via ontheworldmap.com

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NagoyaStation.com has created a combined Nagoya municipal subway and rail map.

[Nagoya Municipal Subway and Rail Map by NagoyaStation.com.]

Nagoya Subway links and resources

Nagoya Municipal Subway: kotsu.city.nagoya.jp
Wikipedia: Wikipedia