greenbelt
/ˈɡrinˌbɛlt/
noun
- An area of open land, often with trees and grass, around a city where building is limited to protect nature and provide recreation.
- We went for a bike ride along the greenbelt that surrounds the town.
- The city council voted to expand the greenbelt to preserve more farmland.
- Houses are not allowed to be built in the greenbelt to keep the area natural.