The Greenbelt (Ottawa) reference article from the English Wikipedia on 24-Apr-2004
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Greenbelt (Ottawa)

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The Greenbelt is a ring of land, surrounding the city of Ottawa in which real estate development is not permitted. The Greenbelt is maintained by the National Capital Commission (NCC). It was created when it was worried urban sprawl would destroy the pristine areas surrounding the city. The goal of the project is to create an urban forest. To date, the Ottawa Greenbelt is among the largest urban parks in the world.