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Mayor Bloomberg announced the completion of phase 1 of the Manhattan Greenway, a 32 mile bike path and walkway around Manhattan. The ultimate vision is to have one continuous loop around Manhattan's waterfront, so pedestrians, runners, bikers, bladers, everyone, can enjoy the city. However, currently only 23 miles are on the waterfront, due to "construction on the Manhattan Bridge and security issues at the United Nations."

The Mayor's press release.

Map of Manhattan Greenway (PDF)