According to the United States Environmental Protection Agency, open space is any open piece of land that is undeveloped (has no buildings or other built structures) and is accessible to the public. Open space can include:
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Green space (land that is partly or completely covered with grass, trees, shrubs, or other vegetation). Green space includes parks, community gardens, and cemeteries.
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Schoolyards
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Playgrounds
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Public seating areas
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Public plazas
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Vacant lots